Update dependency graphql to v15.3.0 (#403)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -56,7 +56,7 @@
     "eslint-plugin-node": "11.1.0",
     "eslint-plugin-promise": "4.2.1",
     "eslint-plugin-standard": "4.0.1",
-    "graphql": "15.2.0",
+    "graphql": "15.3.0",
     "mongodb": "3.5.9",
     "husky": "4.2.5",
     "jest": "26.1.0",