Bump version to 6.17.1

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v6.17.0...0e806699bf7a17eb3fdb35a8b2924bb80a3d1f7c

• Release notes:

### Fixes

- !622 Make a follow up note to relate QA issue
- !623 Improve stacktrace detection to relate QA failures to known issues

### Doc changes

- !624 Add how to run specific tests

• 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.