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

Author: renovate[bot]

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
               with:
                   distribution: 'temurin'
                   java-version: 25
-            - uses: gradle/actions/setup-gradle@v5
+            - uses: gradle/actions/setup-gradle@v6
               # gradle-build-action doesn't support caching files in the project dir
             - uses: actions/cache@v5
               with: