Bump graphql from 16.2.0 to 16.6.0

Bumps [graphql](https://github.com/graphql/graphql-js) from 16.2.0 to 16.6.0.
- [Release notes](https://github.com/graphql/graphql-js/releases)
- [Commits](graphql/graphql-js@v16.2.0...v16.6.0)

---
updated-dependencies:
- dependency-name: graphql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -31,7 +31,7 @@
     "express-rate-limit": "^5.2.6",
     "express-validator": "^6.9.2",
     "firebase-admin": "^9.5.0",
-    "graphql": "^16.2.0",
+    "graphql": "^16.6.0",
     "graphql-tag": "^2.12.6",
     "mongoose": "^5.13.15",
     "node-cache": "^5.1.2",