Fix docker in docker in our CI templates

We recently had docker in docker problems:

• gitlab-runner#4501 (closed)
• https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31417
• gitlab-com/gl-infra/production#1023 (closed)

We probably need to make sure that our docker templates work correctly:

lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml
15:    - docker:stable-dind

lib/gitlab/ci/templates/Security/Dependency-Scanning.gitlab-ci.yml
15:    - docker:stable-dind

lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml
32:    - docker:stable-dind

lib/gitlab/ci/templates/Jobs/Code-Quality.gitlab-ci.yml
6:    - docker:stable-dind

lib/gitlab/ci/templates/Jobs/Build.gitlab-ci.yml
7:    - docker:stable-dind

lib/gitlab/ci/templates/Jobs/Browser-Performance-Testing.gitlab-ci.yml
8:    - docker:stable-dind

The following discussion from gitlab-ce!31417 should be addressed:

• @tmaczukin started a discussion: (+3 comments)

  @leipert Two suggestions, basing on the problem that we've investigated last week. Let's use explicitly tagged versions of the DinD image. With 19.03.0-dind that I've proposed, you could leave the DOCKER_HOST unchanged. You can also use the latest version (19.03.1-dind) but in that case removing DOCKER_HOST declaration is required.