chore: upgrade typing on private modules

[bdraco]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #402 will not alter performance

_{Comparing upgrade_typing (b2c1b07) with main (dc3d8e7)}

Summary

✅ 3 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 89.79592% with 5 lines in your changes missing coverage. Please review.

Project coverage is 84.11%. Comparing base (dc3d8e7) to head (b2c1b07).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dbus_fast/_private/util.py	80.00%	2 Missing and 1 partial ⚠️
src/dbus_fast/_private/address.py	50.00%	1 Missing ⚠️
src/dbus_fast/_private/unmarshaller.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   83.98%   84.11%   +0.13%     
==========================================
  Files          28       29       +1     
  Lines        3390     3394       +4     
  Branches      605      603       -2     
==========================================
+ Hits         2847     2855       +8     
+ Misses        337      333       -4     
  Partials      206      206              

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