Bump actions/checkout from 4.1.7 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.7...v4.2.1)

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

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

.github/workflows/ci-actions.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         java: [17, 21]
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.1
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v4.2.2
         with: