Bump VERSION to 2.1.4

• Diff: https://gitlab.com/gitlab-org/gitlab-dangerfiles/compare/v2.1.3...a786e94

• Release notes:

### Fixes

- !53 Fix the 'Apply suggestion' commit pattern to properly detect such commits.

• Checklist before merging:

  • Diff link is up-to-date.
  • Based on the diff, lib/gitlab/dangerfiles/version.rb is updated, according to SemVer.
  • Release notes are accurate.

• Checklist after merging:

  • Update the release notes for the newly created tag.