Update serialization

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.04%. Comparing base (45274a6) to head (1f857b5). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
foamlib/_files/_serialization.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #263 +/- ## ========================================== - Coverage 86.10% 86.04% -0.06% ========================================== Files 16 16 Lines 1360 1362 +2 ========================================== + Hits 1171 1172 +1 - Misses 189 190 +1 ```

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