Bump version to 4.19.2

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v4.19.1...06212fa99fcf2f63966f92aa7898bb88dd22f36e

• Release notes:

### Fixes

- !383 Add cookie support in API requests to fetch Canary revision version

• 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:

  • Create a tag for the new release version.