Bump version to 15.10.1

This releases the fix for support/setup/gitlab_duo_setup.rb !1478 (merged)

15.10.1 is a patch bump. It includes one fix, one dependency update, one documentation change, and one CI change.

Diff

15.10.0...9675b898

Pre-merge checklist

• Diff link is up-to-date.
• Check the release notes: https://gitlab.com/api/v4/projects/gitlab-org%2Fgitlab-qa/repository/changelog?version=15.10.1
• Based on the diff and the release notes, version.rb is updated, according to SemVer.

Post-merge checklist

• In the pipeline-common project, update the GITLAB_QA_VERSION (make sure to add a Changelog: trailer to the commit) and create a release.
• Unless already done by renovate-gitlab-bot, in the GitLab project, update the ref for pipeline-common in .gitlab/ci/qa-common/main.gitlab-ci.yml.
• Unless already done by renovate-gitlab-bot, or if you need it sooner, in the GitLab project, update the gitlab-qa gem version in qa/Gemfile and qa/Gemfile.lock (for an example, see: gitlab!117054 (merged)).

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