Update go mod to ensure bolt is using 1.3.5

Bolt 1.3.6 fails to build correctly and has been removed, so rollback to bolt 1.3.5. Also upgrade to Go 1.18

vendor/github.com/gorilla/websocket/proxy.go

@@ -48,7 +48,7 @@ func (hpd *httpProxyDialer) Dial(network string, addr string) (net.Conn, error)
 	}
 
 	connectReq := &http.Request{
-		Method: "CONNECT",
+		Method: http.MethodConnect,
 		URL:    &url.URL{Opaque: addr},
 		Host:   addr,
 		Header: connectHeader,