Bump playframework/.github/.github/workflows/rtm.yml from 3 to 4

Bumps [playframework/.github/.github/workflows/rtm.yml](https://github.com/playframework/.github) from 3 to 4.
- [Release notes](https://github.com/playframework/.github/releases)
- [Commits](playframework/.github@v3...v4)

---
updated-dependencies:
- dependency-name: playframework/.github/.github/workflows/rtm.yml
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -29,4 +29,4 @@ jobs:
     if: github.event_name == 'pull_request'
     needs: # Should be last
       - "tests"
-    uses: playframework/.github/.github/workflows/rtm.yml@v3
+    uses: playframework/.github/.github/workflows/rtm.yml@v4