Update the use of 'package:shelf_web_socket's `webSocketHandler` method #141

Job	Run time
health / breaking	0s
health / coverage	0s
health / leaking	0s
health / license	0s
health / changelog / run changelog health check	31s
health / do-not-submit / run do-not-submit health check	30s
health / comment	9s
	1m 10s

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