chore(deps): update gradle/actions action to v6 (#63)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build-pr.yml

@@ -20,6 +20,6 @@ jobs:
           distribution: temurin
           java-version: 25
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
       - name: Build on ${{ matrix.os }}
         run: ./gradlew clean build test

.github/workflows/main-build.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v6
       - name: Setup gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
       - name: Setup Java
         uses: actions/setup-java@v5
         with: