Update dependency qs to v6.11.0

Author: renovate[bot]

package-lock.json

@@ -27,7 +27,7 @@
     "moment-timezone": "0.5.33",
     "morgan": "1.9.1",
     "pug": "3.0.2",
-    "qs": "6.10.1",
+    "qs": "6.11.0",
     "respond.js": "1.4.2",
     "uuid": "8.3.2"
   },