fix: http MIME encoded word filename parse

[monkeyWie]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 59.69%. Comparing base (cb07ce5) to head (3823588).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/test/httptest.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #931      +/-   ##
==========================================
- Coverage   59.89%   59.69%   -0.20%     
==========================================
  Files          36       36              
  Lines        4523     4538      +15     
==========================================
  Hits         2709     2709              
- Misses       1540     1555      +15     
  Partials      274      274              

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