Remove deprecated X-chain pubsub server

go.mod

@@ -22,7 +22,6 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/rpc v1.2.0
-	github.com/gorilla/websocket v1.5.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/holiman/uint256 v1.2.4
 	github.com/huin/goupnp v1.3.0
@@ -121,6 +120,7 @@ require (
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/hashicorp/go-bexpr v0.1.10 // indirect
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d // indirect