etcdserver: Fix 64 KB websocket notification message limit (#12403)
etcdserver: Fix 64 KB websocket notification message limit (#12403)

This fixes etcd being unable to send any message longer than 64 KB as
a notification over the websocket. This was because the older version
of grpc-websocket-proxy was used and WithMaxRespBodyBufferSize option
wasn't set.

Co-authored-by: Vitaliy Filippov <53e369a295c879c0950c38ac4f6245a0983f1438@yourcmc.ru>
mkumatag/etcd,ajityagaty/etcd,mkumatag/etcd,li-ang/etcd,etcd-io/etcd,rnaveiras/etcd,rnaveiras/etcd,etcd-io/etcd,ajityagaty/etcd,ajityagaty/etcd,mqliang/etcd,etcd-io/etcd,gyuho/etcd,mqliang/etcd,li-ang/etcd,gyuho/etcd,coreos/etcd,coreos/etcd,mkumatag/etcd,mqliang/etcd,rnaveiras/etcd