Bump gradle/actions from 4.1.0 to 4.2.1 (#350)

Bumps [gradle/actions](https://github.com/gradle/actions) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/gradle/actions/releases)
- [Commits](gradle/actions@d156388...cc4fc85)

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

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

.github/workflows/pr-checks.yml

@@ -13,6 +13,6 @@ jobs:
         distribution: 'temurin'
         java-version: 8
     - name: Setup Gradle
-      uses: gradle/actions/setup-gradle@d156388eb19639ec20ade50009f3d199ce1e2808
+      uses: gradle/actions/setup-gradle@cc4fc85e6b35bafd578d5ffbc76a5518407e1af0
     - name: gradle
       run: ./gradlew check javadoc