Update version to 8.10.2

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v8.10.1...475f2a23c6f6c6f1d05328dfa3e548a30a693103

• Release notes:

### Fixes

- !1073 Fix join on string error in failure reporting
- !1071 Skip issue reporting for features/sanity specs
- !1075 Move transient error skip to failure issue script

• 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.