Remove Ming Qiu from maintainers

[qiuming-best]

Thank you for contributing to Velero!

Please add a summary of your change

Removing myself from the maintainers list.

Does your change fix a particular issue?

Fixes #(issue)

Please indicate you've done the following:

• [ ] Accepted the DCO. Commits without the DCO will delay acceptance.
• [ ] Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• [ ] Updated the corresponding documentation in site/content/docs/main.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.94%. Comparing base (ec2013b) to head (677d99a). Report is 11 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8411 +/- ## ========================================== - Coverage 58.95% 58.94% -0.01% ========================================== Files 367 367 Lines 38902 38926 +24 ========================================== + Hits 22933 22945 +12 - Misses 14507 14518 +11 - Partials 1462 1463 +1 ```

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