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.yml

@@ -26,7 +26,7 @@ jobs:
             python_version: "3.9"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Choose Python version ${{ matrix.python_version }}
         uses: actions/setup-python@v5
         with:
@@ -50,7 +50,7 @@ jobs:
         envs: ["numba_coverage", "docs-check"]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: 'Choose Python version 3.11'
         uses: actions/setup-python@v5
         with:
@@ -69,7 +69,7 @@ jobs:
   build-docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: 'Choose Python version 3.11'
         uses: actions/setup-python@v5
         with:
@@ -115,7 +115,7 @@ jobs:
       LT_RELEASE_UPLOAD_ZENODO_SANDBOX_PARENT: ${{ secrets.LT_RELEASE_UPLOAD_ZENODO_SANDBOX_PARENT }}
       LT_RELEASE_UPLOAD_ZENODO_PARENT: ${{ secrets.LT_RELEASE_UPLOAD_ZENODO_PARENT }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Choose Python version 3.10
         uses: actions/setup-python@v5
         with: