xrpl-go tries to read from websocket even after its connection is closed

[pkcs8]

[pkcs8]

2023/10/18 00:03:37 WS read error: read tcp 192.168.1.2:57967->42.43.44.45:443: use of closed network connection

Review mutex placement around websocket reader.

[pkcs8]

2024/01/04 23:52:45 WS reconnection error: wss://xrplcluster.com dial tcp 21.42.63.84:80: i/o timeout