Bump actions/checkout from 3 to 4

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]>

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Get source code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v4
@@ -56,7 +56,7 @@ jobs:
         run: pip install --upgrade pip
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Python requirements
         run: pip install flake8
@@ -76,7 +76,7 @@ jobs:
       run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
 
     - name: Get source code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python 3.10
       uses: actions/setup-python@v4