Modifying googles cloud-sdk image to be pulled from gcr repo since they will deprecate dockerhub in 3/21 and the current image may have broken our sync gcs ci step

.circleci/config.yml

@@ -89,7 +89,7 @@ jobs:
 
   sync_gcs:
     docker:
-      - image: google/cloud-sdk
+      - image: gcr.io/google.com/cloudsdktool/cloud-sdk:323.0.0
     working_directory: ~/mozilla/telemetry-airflow
     steps:
       - checkout