Update typing

[gerlero]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.58%. Comparing base (f9f6dbc) to head (18590ac).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
foamlib/_files/_serialization.py	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
- Coverage   86.69%   86.58%   -0.11%     
==========================================
  Files          16       16              
  Lines        1338     1342       +4     
==========================================
+ Hits         1160     1162       +2     
- Misses        178      180       +2     

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