Bump actions/checkout from 4.1.7 to 4.2.0 in the actions-version group

Bumps the actions-version group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4.1.7 to 4.2.0
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.7...v4.2.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/doc.yaml

@@ -27,7 +27,7 @@ jobs:
     name: Build documentation
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4.1.7
+    - uses: actions/checkout@v4.2.0
     - name: Install mdbook
       run: |
         mkdir -p "$HOME/.cargo/bin"