Bump version to 7.23.0

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/-/compare/v7.22.1...769d8c759cd1e83d40a9c00fe44581daa0685ff4

• Release notes:

### Fixes

- !858 Stub QA_RUN_TYPE environment variable so it's not picked up if exists
- !854 Stub environment for test session spec
- !792 Use latest tag on minio after fix

### Other changes (CI, backstage)

- !859 Add link to grafana to test session report

• 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.