chore(lint): Increasing lint difficulty level

[fclairamb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.73077% with 76 lines in your changes are missing coverage. Please review.

Project coverage is 85.86%. Comparing base (d2726de) to head (ffcde43).

Files	Patch %	Lines
handle_files.go	81.25%	9 Missing and 6 partials ⚠️
server.go	78.87%	13 Missing and 2 partials ⚠️
handle_dirs.go	75.00%	7 Missing and 7 partials ⚠️
transfer_active.go	60.86%	6 Missing and 3 partials ⚠️
client_handler.go	84.61%	4 Missing and 4 partials ⚠️
control_unix.go	0.00%	6 Missing ⚠️
handle_auth.go	84.00%	2 Missing and 2 partials ⚠️
transfer_pasv.go	89.18%	4 Missing ⚠️
asciiconverter.go	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
- Coverage   86.79%   85.86%   -0.93%     
==========================================
  Files          11       11              
  Lines        1620     1712      +92     
==========================================
+ Hits         1406     1470      +64     
- Misses        148      167      +19     
- Partials       66       75       +9     

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