fix: disconnect race in tests

[bdraco]

Fixes the test closing out the underlying fd and getting python confused which lead to random failures and segfaults

[codecov]

Codecov Report

Base: 81.43% // Head: 81.46% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (88eb6e5) compared to base (18213c0).
Patch has no changes to coverable lines.

❗ Current head 88eb6e5 differs from pull request most recent head e52d276. Consider uploading reports for the commit e52d276 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   81.43%   81.46%   +0.03%     
==========================================
  Files          25       25              
  Lines        2930     2930              
  Branches      567      567              
==========================================
+ Hits         2386     2387       +1     
+ Misses        335      334       -1     
  Partials      209      209              

Impacted Files	Coverage Δ
src/dbus_fast/aio/message_bus.py	86.72% <0.00%> (-0.89%)	⬇️
src/dbus_fast/message_bus.py	72.05% <0.00%> (-0.39%)	⬇️
src/dbus_fast/glib/message_bus.py	83.12% <0.00%> (+2.05%)	⬆️

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