LibreLinkUp: add logging when server region is incorrect

[mammuth]

Apparently, the LibreLinkUp API has many regions and accounts are expected to use their region-specific API. In such a case, all other regions return a redirect.

Example log output:

2023-12-17 11:37:08,662 Connecting to 192.168.178.20:8086
2023-12-17 11:37:08,692 Auth ticket not found or expired, requesting a new one
2023-12-17 11:37:09,888 Authentication failed. Server response:
2023-12-17 11:37:09,890 {'status': 0, 'data': {'redirect': True, 'region': 'de'}}
2023-12-17 11:37:09,891 The LibreLinkUp API returned a redirect. You should try the following url for LIBRELINKUP_URL in config.py: https://api-de.libreview.io