Bump version to 7.25.1

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v7.25.0...344407a2a63fb43f3f60a83865efb628bdee5b61

• Release notes:

### New scenarios and scenario updates

- !917 Use named argument to pass mattermost address

### Fixes

- !916 Fixes `QA_IMAGE_TAG` value when set from `TOP_UPSTREAM_SOURCE_REF`

### Other changes (CI, backstage)

- !912 Update elasticsearch default version to pipeline common version
- !910 Improve upstream notification to post to MR instead of commit
- !919 Skip failure issue creation when quarantined
- !913 Improvements to dynamic child pipeline setup
- !920 Speed up environment teardown by removing docker stop command

• 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.