Remove unused QtBluetooth dependency in Windows tests

Tests hang on Windows agents. When connected on the machine and running tests manually, we can see dialog with the following error message:

This Windows version does not support the required Bluetooth API.

It seems that tests are loading all PyQt modules, even if they are not used, and PyQt >= 5.10 has DLLs that are incompatible with Windows < 10, such as QtBluetooth.