fix: cleanup typing in marshaller and unmarshaller

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 82.38% // Head: 82.32% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (d725227) compared to base (091c262).
Patch coverage: 91.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   82.38%   82.32%   -0.07%     
==========================================
  Files          27       27              
  Lines        3157     3162       +5     
  Branches      652      652              
==========================================
+ Hits         2601     2603       +2     
- Misses        340      342       +2     
- Partials      216      217       +1     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/marshaller.py	93.37% <90.00%> (-0.51%)	⬇️
src/dbus_fast/_private/unmarshaller.py	96.46% <96.00%> (+<0.01%)	⬆️
src/dbus_fast/glib/message_bus.py	80.32% <0.00%> (-2.05%)	⬇️
src/dbus_fast/proxy_object.py	78.52% <0.00%> (+2.01%)	⬆️

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