fix: Don't import from dbus module on Windows

[koenvervloesem]

Currently importing from Bluetooth Adapters on Windows results in an error because the dbus module is imported. This PR changes the import to a conditional one depending on the operating system. Fixes #56

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.25 ⚠️

Comparison is base (67d4d35) 97.92% compared to head (3918166) 97.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   97.92%   97.68%   -0.25%     
==========================================
  Files          12       12              
  Lines         386      388       +2     
  Branches       67       46      -21     
==========================================
+ Hits          378      379       +1     
  Misses          6        6              
- Partials        2        3       +1     

Impacted Files	Coverage Δ
src/bluetooth_adapters/__init__.py	91.66% <66.66%> (-8.34%)	⬇️

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[bdraco]

Thanks @koenvervloesem