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/ci_docs.yml

@@ -21,7 +21,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0  # fetch all history for all branches and tags
       - uses: actions/setup-python@v4

.github/workflows/ci_test-acts.yml

@@ -23,7 +23,7 @@ jobs:
     timeout-minutes: 15
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0  # fetch all history for all branches and tags
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/docs-deploy.yml

@@ -16,7 +16,7 @@ jobs:
       PATH_DATASETS: ${{ github.workspace }}/.datasets
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: publication
       - uses: actions/setup-python@v4