Upgrade: Bump the actions group with 1 update (#69)

Bumps the actions group with 1 update: [OpenTTD/actions](https://github.com/openttd/actions).


Updates `OpenTTD/actions` from 4 to 5
- [Release notes](https://github.com/openttd/actions/releases)
- [Commits](v4...v5)

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

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

.github/workflows/rw-annotation-check.yml

@@ -16,4 +16,4 @@ jobs:
 
     steps:
     - name: Check annotations
-      uses: OpenTTD/actions/annotation-check@v4
+      uses: OpenTTD/actions/annotation-check@v5