chore: Add more lints

[larseggert]

Same as neqo.

[codecov]

Codecov Report

Attention: Patch coverage is 94.33962% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.71%. Comparing base (bb286ef) to head (0d2be45).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bsd.rs	95.00%	0 Missing and 1 partial ⚠️
src/linux.rs	96.29%	0 Missing and 1 partial ⚠️
src/routesocket.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   86.28%   86.71%   +0.43%     
==========================================
  Files           5        5              
  Lines         554      557       +3     
  Branches      554      557       +3     
==========================================
+ Hits          478      483       +5     
  Misses         48       48              
+ Partials       28       26       -2     

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