Modify the repository-maintenance.md for the label and annotation change

[blackpiglet]

Thank you for contributing to Velero!

Please add a summary of your change

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.57%. Comparing base (bfd9bc5) to head (2fa8cb2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8977   +/-   ##
=======================================
  Coverage   59.57%   59.57%           
=======================================
  Files         370      370           
  Lines       40278    40278           
=======================================
  Hits        23995    23995           
  Misses      14780    14780           
  Partials     1503     1503           

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[kaovilai]

This PR dupes #8930 a little bit. Feel free to merge whichever one.

[blackpiglet]

This PR dupes #8930 a little bit. Feel free to merge whichever one.

@kaovilai I didn't notice #8930 is also related to this topic.
Since your PR is created before this one, we can track this issue in #8930.