Update dependency yarn to v1.22.9

package.json

@@ -186,6 +186,6 @@
     "webpack-cli": "3.3.12",
     "webpack-dev-server": "3.11.0",
     "webpack-node-externals": "2.5.2",
-    "yarn": "1.22.4"
+    "yarn": "1.22.9"
   }
 }