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

Author: renovate[bot]

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
           distribution: 'temurin'
           java-version: 21
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/main' }}
       - name: Build with Gradle

.github/workflows/maven-publish.yml

@@ -14,7 +14,7 @@ jobs:
           distribution: 'temurin'
           java-version: 21
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/main' }}
       - name: Publish with Gradle to Repository