build: enable dependencies caching (#1567)

Author: valfirst

.github/workflows/gradle.yml

@@ -20,5 +20,6 @@ jobs:
       with:
         distribution: 'zulu'
         java-version: 8
+        cache: 'gradle'
     - name: Build with Gradle
       run: ./gradlew clean build -x signMavenJavaPublication -x test -x checkstyleTest