Replace pybluez from Pip with python3-bluez from APT

[MaxG87]

On Debian Bookworm, in a Conda environment providing Python 3.9.12, it was not possible to install the pybluez package. The error message was

Preparing metadata (setup.py) ... error
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [1 lines of output]
    error in PyBluez setup command: use_2to3 is invalid.
    [end of output]

Since the same package is provided by python3-bluez in APT, one can switch to that. It seems preferable to stick with the distribution's package, since this guarantees a functional setup script throughout the lifetime of the distribution.