Update gradle/actions action to v4 (#3265)

* Update gradle/actions action to v4

* Remove unnecessary gradle validation after action update to v4

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jorge Martín <jorgem@element.io>

.github/workflows/generate_github_pages.yml

@@ -19,7 +19,7 @@ jobs:
           distribution: 'temurin' # See 'Supported distributions' for available options
           java-version: '17'
       - name: Configure gradle
-        uses: gradle/actions/setup-gradle@v3
+        uses: gradle/actions/setup-gradle@v4
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/develop' }}
       - name: Set up Python 3.12