Update gradle/actions action to v6 (#494)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yaml

@@ -20,7 +20,7 @@ jobs:
           distribution: 'zulu'
           java-version-file: .github/workflows/.java-version
 
-      - uses: gradle/actions/setup-gradle@v5
+      - uses: gradle/actions/setup-gradle@v6
 
       - run: ./gradlew build