Bump actions/checkout from 3.5.3 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.3 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.5.3...v4.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3.5.3
+      - uses: actions/checkout@v4.0.0
       - name: Set up Python 3.9
         uses: actions/setup-python@v4.7.0
         with:

.github/workflows/docs.yml

@@ -28,7 +28,7 @@ jobs:
       working-directory: ./docs
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3.5.3
+        uses: actions/checkout@v4.0.0
       - name: Set up Python 3.9
         uses: actions/setup-python@v4.7.0
         with:

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3.5.3
+        uses: actions/checkout@v4.0.0
       - name: Set up Python 3.9
         uses: actions/setup-python@v4.7.0
         with: