Bump actions/checkout from 4 to 5 (#254)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
         script: |
           version = context.payload.inputs.version;
           if (/^v/.test(version)) throw new Error("Bad version number: " + version)
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache data/sources
       uses: ./.github/cache-sources-action
     - uses: actions/setup-java@v4