feat: avoid enum dunder overhead in message_bus calls

[bdraco]

[codecov]

Codecov Report

Base: 82.55% // Head: 82.20% // Decreases project coverage by -0.34% ⚠️

Coverage data is based on head (a22f811) compared to base (fb0cc35).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   82.55%   82.20%   -0.35%     
==========================================
  Files          27       27              
  Lines        3153     3153              
  Branches      651      651              
==========================================
- Hits         2603     2592      -11     
- Misses        338      343       +5     
- Partials      212      218       +6     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/aio/message_bus.py	85.71% <100.00%> (-0.07%)	⬇️
src/dbus_fast/aio/proxy_object.py	96.55% <100.00%> (+0.06%)	⬆️
src/dbus_fast/glib/message_bus.py	80.32% <0.00%> (-2.05%)	⬇️
src/dbus_fast/message_bus.py	71.48% <0.00%> (-1.10%)	⬇️

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