Revert "build(deps): bump codecov/codecov-action from 4.6.0 to 5.0.2"

[zhaohuabing]

Reverts #4732

This is blocking CI: https://github.com/envoyproxy/gateway/actions/runs/12025151771/job/33521814999?pr=4754

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.60%. Comparing base (05aa9fd) to head (d5ac918).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4783      +/-   ##
==========================================
- Coverage   65.64%   65.60%   -0.04%     
==========================================
  Files         211      211              
  Lines       31961    31961              
==========================================
- Hits        20980    20968      -12     
- Misses       9745     9753       +8     
- Partials     1236     1240       +4     

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