Update etcd client to 3.3.9

vendor/github.com/gorilla/websocket/BUILD

@@ -4,9 +4,16 @@ go_library(
     name = "go_default_library",
     srcs = [
         "client.go",
+        "client_clone.go",
+        "client_clone_legacy.go",
+        "compression.go",
         "conn.go",
+        "conn_read.go",
+        "conn_read_legacy.go",
         "doc.go",
         "json.go",
+        "mask.go",
+        "prepared.go",
         "server.go",
         "util.go",
     ],