fix: Properly close file descriptors opened by harfile

[Stranger6667]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.91%. Comparing base (80b3c14) to head (4d43881).

Files with missing lines	Patch %	Lines
src/harfile/__init__.py	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   98.56%   97.91%   -0.65%     
==========================================
  Files           3        3              
  Lines         278      288      +10     
  Branches       56       58       +2     
==========================================
+ Hits          274      282       +8     
- Misses          3        4       +1     
- Partials        1        2       +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #71 will not alter performance

_{Comparing dd/fix-closing-file (4d43881) with main (80b3c14)}

Summary

✅ 1 untouched