Bump version to 7.13.2

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v7.13.1...fff761e51abaa7acfe2c0b2cacc04db54df8b748

• Release notes:

### Other changes (CI, backstage)

- https://gitlab.com/gitlab-org/gitlab-qa/-/merge_requests/783

• 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.