bump golangci-lint to 2.9.0

[bluenviron-bot]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.09%. Comparing base (f907e19) to head (ad2d0db).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5449      +/-   ##
==========================================
+ Coverage   59.04%   59.09%   +0.04%     
==========================================
  Files         192      192              
  Lines       16222    16222              
==========================================
+ Hits         9579     9586       +7     
+ Misses       5808     5801       -7     
  Partials      835      835              

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