fix: stop trying to check dbus once the socket is missing

[bdraco]

Each call to get_device would try over and over to connect to dbus when the socket is missing. This is normal when dbus is not setup and only using bluetooth proxies
fixes #69

[codecov]

Codecov Report

Base: 85.38% // Head: 85.71% // Increases project coverage by +0.33% 🎉

Coverage data is based on head (78acbbf) compared to base (09cb73d).
Patch coverage: 87.50% of modified lines in pull request are covered.

❗ Current head 78acbbf differs from pull request most recent head 6137eb5. Consider uploading reports for the commit 6137eb5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   85.38%   85.71%   +0.33%     
==========================================
  Files           2        2              
  Lines         301      308       +7     
  Branches       74       76       +2     
==========================================
+ Hits          257      264       +7     
+ Misses         31       30       -1     
- Partials       13       14       +1     

Impacted Files	Coverage Δ
src/bleak_retry_connector/__init__.py	87.88% <87.50%> (+0.30%)	⬆️

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