Update version to 8.3.1

Diff

• https://gitlab.com/gitlab-org/gitlab-qa/compare/v8.3.1...0b7bc46bb25fd273699291b433dc741e6cd4d40d

Release notes:

Other changes (CI, backstage)

• Replace docker inspect with list filter (!1013 - merged)

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.