Bump gorilla websocket to 1.5.1+
/area build
Since upstream gorilla websocket changed SetCloseHandler to handle a returned error from WriteControl():
https://github.com/gorilla/websocket/blob/666c197fc9157896b57515c3a3326c3f8c8319fe/conn.go#L1166-L1168
serving's unit test TestServerShutdown() started failing as websocket does not return CloseError.
We temporary pin to gorilla websocket to 1.5.0 but should be fixed.
Please refer to https://github.com/knative/serving/pull/14588 for the error log.
Working in progress https://github.com/gorilla/websocket/pull/863
Ugh... https://github.com/gorilla/websocket/pull/863 was merged but there is still a log noise issue https://github.com/gorilla/websocket/issues/880 in 1.5.1...
Thanks, we'll track https://github.com/gorilla/websocket/issues/880 then.
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