feat: upgrade graphql from 15.3.0 to 16.6.0

Snyk has created this PR to upgrade graphql from 15.3.0 to 16.6.0.

See this package in npm:
https://www.npmjs.com/package/graphql

See this project in Snyk:
https://app.snyk.io/org/contentstack-ecosystem/project/bb48899f-43b7-42e5-bb5a-5324b1f36a23?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@apollo/client": "^3.0.2",
     "apollo-client": "^2.6.10",
-    "graphql": "^15.3.0",
+    "graphql": "^16.6.0",
     "react": "16.13.1",
     "react-apollo": "^3.1.5",
     "react-native": "0.63.0",