ci: install HDF5 and C-blosc explicitly for pytables issue on MacOS

This commit tries to fix some flakiness of the test execution over MacOS-based instances over GitHub Actions.

It appears to be an issue of the `tables` dependency. From the logs of the CI: (https://github.com/bancaditalia/black-it/actions/runs/7121188681/job/19389914846?pr=78#step:5:62)

```
Fatal Python error: Illegal instruction

Current thread 0x000000011783c600 (most recent call first):
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/tables/node.py", line 246 in __init__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/tables/leaf.py", line 264 in __init__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/tables/carray.py", line 200 in __init__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/tables/earray.py", line 143 in __init__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/tables/file.py", line 1345 in create_earray
  File "/Users/runner/work/black-it/black-it/black_it/utils/json_pandas_checkpointing.py", line 211 in save_calibrator_state
  File "/Users/runner/work/black-it/black-it/tests/test_utils/test_pandas_json_checkpointing.py", line 58 in test_save_and_load_calibrator_state
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/python.py", line 194 in pytest_pyfunc_call
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_callers.py", line 77 in _multicall
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_manager.py", line 115 in _hookexec
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_hooks.py", line 493 in __call__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/python.py", line 1792 in runtest
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 169 in pytest_runtest_call
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_callers.py", line 77 in _multicall
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_manager.py", line 115 in _hookexec
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_hooks.py", line 493 in __call__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 262 in <lambda>
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 341 in from_call
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 261 in call_runtest_hook
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 222 in call_and_report
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 133 in runtestprotocol
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/runner.py", line 114 in pytest_runtest_protocol
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_callers.py", line 77 in _multicall
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_manager.py", line 115 in _hookexec
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_hooks.py", line 493 in __call__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/main.py", line 350 in pytest_runtestloop
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_callers.py", line 77 in _multicall
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_manager.py", line 115 in _hookexec
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_hooks.py", line 493 in __call__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/main.py", line 325 in _main
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/main.py", line 271 in wrap_session
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/main.py", line 318 in pytest_cmdline_main
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_callers.py", line 77 in _multicall
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_manager.py", line 115 in _hookexec
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/pluggy/_hooks.py", line 493 in __call__
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/config/__init__.py", line 169 in main
  File "/Users/runner/work/black-it/black-it/.tox/py310/lib/python3.10/site-packages/_pytest/config/__init__.py", line 192 in console_main
  File "/Users/runner/work/black-it/black-it/.tox/py310/bin/pytest", line 8 in <module>
```

A successful workaround seems to install HDF5 and C-blosc explicitly in the preliminary steps on CI for MacOS images.
This step was part of the installation instructions of PyTables v3.9.2: https://github.com/PyTables/PyTables/blob/v3.9.2/README.rst#installation
Moreover, as explained here: https://stackoverflow.com/questions/73029883/could-not-find-hdf5-installation-for-pytables-on-m1-mac, sometimes must be explicitly set the environment path variables where HDF5 ahd C-blosc are installed

For some reason this is not needed on Ubuntu and Windows runners.

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [macos-11]
         python-version: [3.8, 3.9, "3.10", "3.11"]
 
     timeout-minutes: 30
@@ -37,14 +37,23 @@ jobs:
 #      env:
 #        ACTIONS_ALLOW_UNSECURE_COMMANDS: true
 #      run: ...
-    - if: ${{ (matrix.os == 'ubuntu-latest') || (matrix.os == 'macos-latest') }}
-      name: Unit tests and coverage (ubuntu-latest, macos-latest)
+    - if: matrix.os == 'macos-11'
+      name: Install dependencies (macos-11)
+      run: |
+        # for some reason this seems to be a necessary step for MacOS images, but not for Ubuntu and Windows
+        brew install hdf5
+        brew install c-blosc
+        # https://stackoverflow.com/questions/73029883/could-not-find-hdf5-installation-for-pytables-on-m1-mac
+        echo "HDF5_DIR=/usr/local/" >> $GITHUB_ENV
+        echo "BLOSC_DIR=/usr/local/" >> $GITHUB_ENV
+    - if: ${{ (matrix.os == 'ubuntu-latest') || (matrix.os == 'macos-11') }}
+      name: Unit tests and coverage (ubuntu-latest, macos-11)
       run: |
         pyver=`echo ${{ matrix.python-version }} | tr -d "."`
         tox -e py${pyver} -- -m 'not e2e'
         tox -e py${pyver}-nb
-    - if: ${{ (matrix.os == 'ubuntu-latest') || (matrix.os == 'macos-latest') }}
-      name: Notebook tests (ubuntu-latest, macos-latest)
+    - if: ${{ (matrix.os == 'ubuntu-latest') || (matrix.os == 'macos-11') }}
+      name: Notebook tests (ubuntu-latest, macos-11)
       run: |
         pyver=`echo ${{ matrix.python-version }} | tr -d "."`
         tox -e py${pyver}-nb