Use stable image version for dind

See https://gitlab.com/gitlab-com/gl-infra/production/issues/1023

This also has been suggested by Tomasz in the MR

.gitlab/ci/frontend.gitlab-ci.yml

@@ -19,7 +19,7 @@
   dependencies:
     - setup-test-env
   services:
-    - docker:stable-dind
+    - docker:19.03.0-dind
   variables:
     NODE_ENV: "production"
     RAILS_ENV: "production"

.gitlab/ci/review.gitlab-ci.yml

@@ -35,7 +35,7 @@
   <<: *review-base
   image: registry.gitlab.com/gitlab-org/gitlab-build-images:gitlab-qa-alpine
   services:
-    - docker:stable-dind
+    - docker:19.03.0-dind
   tags:
     - gitlab-org
     - docker