[LOCAL] Bump git checkout cache key

Author: kelset

.circleci/config.yml

@@ -48,7 +48,7 @@ references:
 
   cache_keys:
     buck_cache_key: &buck_cache_key v3-buck-v2019.01.10.01-{{ checksum "scripts/circleci/buck_fetch.sh" }}}
-    checkout_cache_key: &checkout_cache_key v1-checkout
+    checkout_cache_key: &checkout_cache_key v2-checkout
     gems_cache_key: &gems_cache_key v1-gems-{{ checksum "Gemfile.lock" }}
     gradle_cache_key: &gradle_cache_key v1-gradle-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}-{{ checksum "ReactAndroid/gradle.properties" }}
     hermes_cache_key: &hermes_cache_key v1-hermes-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/hermes/hermesversion" }}