fix: upgrade qs from 6.11.0 to 6.13.0

Snyk has created this PR to upgrade qs from 6.11.0 to 6.13.0.

See this package in npm:
qs

See this project in Snyk:
https://app.snyk.io/org/konstantin.yaroshovets/project/156051c6-dd3e-4c93-8594-efbad8bfd69d?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -88,7 +88,7 @@
     "numeral": "2.0.6",
     "ouanalyse-datatables.net-buttons-html5": "1.5.3",
     "prismjs": "1.29.0",
-    "qs": "6.11.0",
+    "qs": "6.13.0",
     "querystring": "0.2.1",
     "svgsaver": "0.9.0",
     "urijs": "1.19.11",