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

Author: renovate[bot]

.github/workflows/pull_request.yml

@@ -27,7 +27,7 @@ jobs:
           java-version: '21'
 
       - name: Gradle cache
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
 #      - name: AVD cache
 #        uses: actions/cache@v4