chore(deps): update gradle/actions action to v6

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           distribution: "liberica"
           java-version: 25
-      - uses: gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c # v5.0.2
+      - uses: gradle/actions/setup-gradle@39e147cb9de83bb9910b8ef8bd7fff0ee20fcd6f # v6.0.1
         with:
           cache-encryption-key: ${{ secrets.GRADLE_ENCRYPTION_KEY }}
       - run: "./gradlew build --continue"