UNSAFE_LEGACY_RENEGOTIATION_DISABLED error in newer versions of Python #175

Some roombas (such as my 600 series) do not support "RFC 5746 secure renegotiation".
Newer versions of Python use OpenSSL 3, which enforces this standard by default - which means that this library does not work on newer versions of python.

There's some discussion on this on the home assistant core github:
home-assistant/core#82775

From my understanding of the issue, I think where this library sets up the mqtt client
https://github.com/pschmitt/roombapy/blob/master/roombapy/remote_client.py#L84
the ssl context would need modifying as described here:

python/cpython#27776 (comment)

I'm happy to implement this fix, just give me the thumbs up if you'd be happy with the change