build(deps-dev): bump @types/node from 14.14.42 to 15.0.0 (#469)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 14.14.42 to 15.0.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -29,7 +29,7 @@
     "@graphql-tools/schema": "^7.1.3",
     "@graphql-tools/utils": "^7.7.1",
     "@sinonjs/fake-timers": "^7.0.2",
-    "@types/node": "^14.14.20",
+    "@types/node": "^15.0.0",
     "@types/ws": "^7.4.0",
     "@typescript-eslint/eslint-plugin": "^3.6.1",
     "@typescript-eslint/parser": "^3.6.1",