chore: add dragonfly-maintainers as codeowners alongside approvers

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.43%. Comparing base (e57d70a) to head (4e4b3f3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
- Coverage   96.48%   96.43%   -0.06%     
==========================================
  Files          52       52              
  Lines        5783     5783              
  Branches     1858     1858              
==========================================
- Hits         5580     5577       -3     
- Misses        188      190       +2     
- Partials       15       16       +1     

see 2 files with indirect coverage changes

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