Bump graphql from 15.3.0 to 15.4.0 (#6310)

Bumps [graphql](https://github.com/graphql/graphql-js) from 15.3.0 to 15.4.0.
- [Release notes](https://github.com/graphql/graphql-js/releases)
- [Commits](https://github.com/graphql/graphql-js/compare/v15.3.0...v15.4.0)

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package.json

@@ -129,7 +129,7 @@
     "css-loader": "^4.3.0",
     "dotenv": "^8.2.0",
     "ejs": "^3.1.5",
-    "graphql": "^15.3.0",
+    "graphql": "^15.4.0",
     "graphql-request": "^3.1.0",
     "husky": "^4.3.0",
     "jasmine-ajax": "4.0.0",