gitlab-ci-linter is broken since GitLab v16

• POST ci/lint API endpoint deprecated
• https://gitlab.com/devopshq/gitlab-ci-linter/-/issues/4

Whether it get fixed, we find an alternative, or we get rid of this tool.

Alternatives:

• https://pre-commit.com/hooks.html
• https://gitlab.com/smop/pre-commit-hooks
• https://github.com/FalcoSuessgott/lint-gitlab-ci