dependency: Update gradle/actions action to v6

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -21,7 +21,7 @@ jobs:
           java-version: 21
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
       - name: Make gradlew executable
         run: chmod +x gradlew

.github/workflows/publish-release.yml

@@ -20,7 +20,7 @@ jobs:
           java-version: 21
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
       - name: Make gradlew executable
         run: chmod +x gradlew