Bump version to 7.1.1

• Diff: v7.1.0...ab620f24

• Release notes:

### Fixes

- !672 Use TLS certificate for gitaly with subjectAltName.

### Other changes (CI, backstage)

- !693 Create a pipeline when Run pipeline button in the UI is used.

• Checklist before merging:

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

• Checklist after merging:

  • Update the release notes for the newly created tag.