fix: avoid cythonizing SendReply

[bdraco]

This is a workaround since context managers currently have an issue with Cython 3

fixes #229

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.12% 🎉

Comparison is base (ed5c87f) 82.58% compared to head (3fac7e3) 82.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
+ Coverage   82.58%   82.71%   +0.12%     
==========================================
  Files          27       28       +1     
  Lines        3251     3257       +6     
  Branches      673      673              
==========================================
+ Hits         2685     2694       +9     
+ Misses        346      345       -1     
+ Partials      220      218       -2     

Files Changed	Coverage Δ
src/dbus_fast/message_bus.py	71.63% <100.00%> (-0.30%)	⬇️
src/dbus_fast/send_reply.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[bdraco]

Performance impact is effectively zero for Bluez DeviceFound messages since there is no reply

This seems like it will be fine.

Tested on production and no side effects observed (wouldn't expect it from moving code around)