env: introduce support for python 3.12, but drop support for python 3…

….8 due to scipy

As of 2024-02, Python 3.8 is still going to be supproted for 6 months (until
2024-10, see https://devguide.python.org/versions).

At the same time, Python 3.12 was released four months ago, on 2023-10, and will
be supported for five years.

We cannot support both, because scipy 1.10 does not work with python 3.12, and
scipy 1,11 drops python 3.8.

Having to make a choiche, it is probably better to go with the more recent
versions, thus 3.8 has to go down the drain.

.github/workflows/docs.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     timeout-minutes: 30
 
@@ -37,7 +37,7 @@ jobs:
     - name: Install dependencies
       run: |
         pip install tox
-        
+
         # Install markdown-spellcheck
         sudo npm install -g markdown-spellcheck
     - name: Generate Documentation

.github/workflows/lint.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     timeout-minutes: 30
 
@@ -36,4 +36,4 @@ jobs:
       run: tox -e check-copyright
     - name: Misc checks
       run: |
-        tox -e bandit,safety
+        tox -e bandit,safety

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.9, "3.10", "3.11", "3.12"]
 
     timeout-minutes: 30