Update gradle/actions action to v6

Author: renovate[bot]

.github/workflows/maven.yml

@@ -60,7 +60,7 @@ jobs:
     - name: Build and Install with Maven and JDK ${{ matrix.java }}
       run: mvn -B clean install -Dmaven.test.skip=true -Dmaven.javadoc.skip=true -Dmaven.source.skip=true
     - name: Set up Gradle with JDK ${{ matrix.java }}
-      uses: gradle/actions/setup-gradle@v4
+      uses: gradle/actions/setup-gradle@v6
       with:
         gradle-version: 8.14.3
     - name: Run Gradle tests