Merge pull request #5940 from learningequality/dependabot/npm_and_yarn/qs-6.15.2

chore(deps): bump qs from 6.14.2 to 6.15.2

Author: rtibbles

package.json

@@ -88,7 +88,7 @@
     "pako": "^2.1.0",
     "papaparse": "^5.4.1",
     "pdfjs-dist": "^2.16.105",
-    "qs": "^6.14.2",
+    "qs": "^6.15.2",
     "regenerator-runtime": "^0.14.1",
     "spark-md5": "^3.0.0",
     "store2": "^2.14.4",