Update java version for the release branch to 21

Author: indritbeqiri

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: '21'
       - name: Create JPro distribution
         run: |
           ./gradlew clean jproRelease