fix: upgrade apollo-server-express from 2.21.0 to 2.21.1

Snyk has created this PR to upgrade apollo-server-express from 2.21.0 to 2.21.1.

See this package in npm:
https://www.npmjs.com/package/apollo-server-express

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -27,7 +27,7 @@
     "@parse/push-adapter": "3.4.0",
     "@parse/s3-files-adapter": "1.6.0",
     "@parse/simple-mailgun-adapter": "1.2.0",
-    "apollo-server-express": "2.21.0",
+    "apollo-server-express": "2.21.1",
     "bcryptjs": "2.4.3",
     "body-parser": "1.19.0",
     "commander": "5.1.0",