Bump qs from 0.6.6 to 6.9.3

Bumps [qs](https://github.com/ljharb/qs) from 0.6.6 to 6.9.3.
- [Release notes](https://github.com/ljharb/qs/releases)
- [Changelog](https://github.com/ljharb/qs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ljharb/qs/commits/v6.9.3)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -28,7 +28,7 @@
         "nak": "git+https://github.com/cloud9ide/nak.git#6deef931594",
         "netutil": "~0.0.2",
         "optimist": "~0.6.0",
-        "qs": "0.6.6",
+        "qs": "6.9.3",
         "rusha": "0.8.5",
         "send": "~0.1.4",
         "simple-mime": "~0.0.8",