misc: Use old actions/cache for gradle

.gitea/workflows/pipeline.yaml

@@ -135,8 +135,16 @@ jobs:
           distribution: 'temurin'
           java-version: '21'
 
-      - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v3
+      - name: Setup Gradle cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+            legalconsenthub-backend/.gradle
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
 
       - name: Build application
         run: ./gradlew build -x test