Bump VERSION to 4.11.0

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/v4.10.0...32cff4236eef7a35c939918ee53949f5eb88138d

• Release notes:

### Other changes (CI, backstage)

- !327 Add QA_CAN_TEST_ADMIN_FEATURES env var
- !326 Remove quarantine jobs

• 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:

  • Create a tag for the new release version.