Update cache action to v3

Author: theapache64

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
         run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties
 
       - name: Checkout Gradle Build Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ~/.gradle/caches