Bump actions/checkout from 3 to 4 (#18)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
           - windows-latest
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
       run: rustup update stable --no-self-update && rustup default stable
@@ -56,7 +56,7 @@ jobs:
           - windows-latest
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
       run: rustup update stable --no-self-update && rustup default stable
@@ -87,7 +87,7 @@ jobs:
           # - wasm32-wasi
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache cargo build and registry
         uses: actions/cache@v3
         with:
@@ -127,7 +127,7 @@ jobs:
           - windows-latest
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Cache cargo build and registry
       uses: actions/cache@v3
       with:
@@ -161,7 +161,7 @@ jobs:
           - windows-latest
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Cache cargo build and registry
       uses: actions/cache@v3
       with:
@@ -200,7 +200,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache cargo build and registry
         uses: actions/cache@v3
         with:
@@ -264,7 +264,7 @@ jobs:
           #   target: powerpc64-unknown-linux-gnu
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache cargo build and registry
         uses: actions/cache@v3
         with:
@@ -321,7 +321,7 @@ jobs:
   #           target: powerpc64-unknown-linux-gnu
   #   runs-on: ${{ matrix.os }}
   #   steps:
-  #     - uses: actions/checkout@v3
+  #     - uses: actions/checkout@v4
   #     - name: Cache cargo build and registry
   #       uses: actions/cache@v3
   #       with:
@@ -343,7 +343,7 @@ jobs:
     name: valgrind
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache cargo build and registry
         uses: actions/cache@v3
         with:
@@ -378,7 +378,7 @@ jobs:
     name: docs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache cargo build and registry
         uses: actions/cache@v3
         with:
@@ -410,7 +410,7 @@ jobs:
       - test
       - sanitizer
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install latest nightly
         uses: actions-rs/toolchain@v1
         with:

.github/workflows/loc.yml

@@ -25,7 +25,7 @@ jobs:
   loc:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
         run: |