Update version to 7.24.3

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v7.24.2...a730a5d46584db850a898ebf0d251766ec22683d

Release notes:

Fixes

• Fix ldap fixture and tls cert mounting for ci d... (!881 - merged)

Other changes (CI, backstage)

• Replace xml with json in report results spec (!876 - merged)
• Add quarantine type label to results issues and... (!879 - 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.