Change connection retry and socket read error logs to debug level

[ptarjan]

These messages are normal operational events that trigger automatic reconnection, not actionable errors. Reduces log noise from transient network conditions.

Examples of log messages from my instance:

Logger: pychromecast.socket_client
Source: /usr/local/lib/python3.13/site-packages/pychromecast/socket_client.py:416
First occurred: 2:12:41 AM (13 occurrences)
Last logged: 4:17:22 AM

[Play Room speaker(192.168.1.181):8009] Failed to connect to service HostServiceInfo(host='192.168.1.181', port=8009), retrying in 5.0s
[Master Bedroom speaker([::ffff:c0a8:1a8]):8009] Failed to connect to service HostServiceInfo(host='[::ffff:c0a8:1a8]', port=8009), retrying in 5.0s
[Loft speaker(192.168.1.23):8009] Failed to connect to service HostServiceInfo(host='192.168.1.23', port=8009), retrying in 5.0s
[Loft TV(192.168.1.184):8009] Failed to connect to service HostServiceInfo(host='192.168.1.184', port=8009), retrying in 5.0s
[Media Room TV(192.168.1.165):8009] Failed to connect to service HostServiceInfo(host='192.168.1.165', port=8009), retrying in 5.0s

Logger: pychromecast.socket_client
Source: /usr/local/lib/python3.13/site-packages/pychromecast/socket_client.py:624
First occurred: 2:12:41 AM (5 occurrences)
Last logged: 4:17:22 AM

[Kitchen Display(192.168.1.189):8009] Error reading from socket: socket connection broken
[Everywhere(192.168.1.28):32109] Error reading from socket: socket connection broken
[Everywhere(192.168.1.168):32109] Error reading from socket: socket connection broken
[Loft TV(192.168.1.184):8009] Error reading from socket: socket connection broken
[Media Room TV(192.168.1.165):8009] Error reading from socket: socket connection broken