fix: only import from bluetooth_adapters when running on linux

[kroimon]

This avoids an exception on Windows because socket.CMSG_LEN is only available on UNIX platforms.

  File "bleak_retry_connector/__init__.py", line 18, in <module>
    from bluetooth_adapters import load_history_from_managed_objects
  File "bluetooth_adapters/__init__.py", line 12, in <module>
    from .dbus import (
  File "bluetooth_adapters/dbus.py", line 10, in <module>
    from dbus_fast import BusType, Message, MessageType, unpack_variants
  File "dbus_fast/__init__.py", line 1, in <module>
    from . import aio, glib, introspection, message_bus, proxy_object, service
  File "dbus_fast/aio/__init__.py", line 1, in <module>
    from .message_bus import MessageBus
  File "dbus_fast/aio\message_bus.py", line 29, in <module>
    from .message_reader import build_message_reader
  File "dbus_fast/aio/message_reader.py", line 7, in <module>
    from .._private.unmarshaller import Unmarshaller
  File "dbus_fast/_private/unmarshaller.py", line 16, in <module>
    UNIX_FDS_CMSG_LENGTH = socket.CMSG_LEN(MAX_UNIX_FDS_SIZE)
AttributeError: module 'socket' has no attribute 'CMSG_LEN'

[codecov]

Codecov Report

Base: 78.20% // Head: 78.20% // No change to project coverage 👍

Coverage data is based on head (60ea7a6) compared to base (0954d2d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   78.20%   78.20%           
=======================================
  Files           4        4           
  Lines         413      413           
  Branches       99       99           
=======================================
  Hits          323      323           
  Misses         62       62           
  Partials       28       28           

Impacted Files	Coverage Δ
src/bleak_retry_connector/__init__.py	76.96% <100.00%> (ø)

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[bdraco]

Thanks for the PR @kroimon

I think we should fix bluetooth-adapters to not require dbus-fast on windows instead.

[kroimon]

Sure that's also a possibility.
I think both would probably make sense because the use of the import here is guarded by the IS_LINUX constant anyway.