Bump gorilla websocket to 1.5.1+

[nak3]

/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 #14588 for the error log.

[nak3]

Working in progress gorilla/websocket#863

[nak3]

Ugh... gorilla/websocket#863 was merged but there is still a log noise issue gorilla/websocket#880 in 1.5.1...

[ReToCode]

Thanks, we'll track gorilla/websocket#880 then.

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