Update gradle-publish.yml

Author: TrueMB

.github/workflows/gradle-publish.yml

@@ -13,7 +13,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           cache: 'gradle'
-          java-version: '17'
+          java-version: '21'
           distribution: 'adopt'
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v3