add gradle version file to the cache key

Author: hawkrives

.circleci/config.yml

@@ -41,6 +41,7 @@ commands:
           key: &gradle-key >-
             v1-gradle-dependencies
             {{ arch }}
+            {{ checksum "android/gradle/wrapper/gradle-wrapper.properties" }}
             {{ checksum "android/build.gradle" }}
             {{ checksum "android/app/build.gradle" }}
             {{ checksum "node_modules/react-native/package.json" }}