Update ci.yml

[kezhenxu94]

We have a dedicate GitHub actions for header check so this should be updated, and we don't recommend using @main so there is no unexpected behaviors when we have changes in our codebase.

See apache/skywalking-eyes#123

[github-actions]

Welcome to the Apache EventMesh (incubating) community!!
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[codecov]

Codecov Report

Merging #1011 (9d4de94) into master (e521cbf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #1011   +/-   ##
========================================
  Coverage      8.39%   8.39%           
  Complexity      529     529           
========================================
  Files           362     362           
  Lines         23242   23242           
  Branches       2546    2546           
========================================
  Hits           1951    1951           
  Misses        21141   21141           
  Partials        150     150           

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[Alonexc]

Welcome to the eventmesh community, please add an issue for the pr.