Update Circle CI image (#2375)

Author: julianguyen

.circleci/config.yml

@@ -131,8 +131,7 @@ jobs:
             ./tmp/cc-test-reporter upload-coverage -i tmp/codeclimate.total.json
   deploy:
     docker:
-      # TODO: Update this to correct cimg/base
-      - image: buildpack-deps:trusty
+      - image: cimg/base:stable
     steps:
       - checkout
       - run: