Update registry.gitlab.com/dependabot-gitlab/ci-images/buildkit Docker tag to v0.12

Can't show this merge request because the source branch renovate/registry.gitlab.com-dependabot-gitlab-ci-images-buildkit-0.x is missing from project georgekoltsov-multiple-projects-test-4/imported-project-ef029319134ab099. Close this merge request or update the source branch.