Update ci.yml

Author: LeoAndo

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         echo "MAPS_API_KEY=$MAPS_API_KEY" >> local.properties
 
     # gradle cache
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ~/.gradle/caches
         key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}