Bump @types/node from 15.3.0 to 15.6.0 (#374)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 15.3.0 to 15.6.0.
- [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

@@ -54,7 +54,7 @@
     "@testing-library/jest-dom": "^5.12.0",
     "@testing-library/react": "^11.2.7",
     "@types/fs-extra": "^9.0.11",
-    "@types/node": "^15.3.0",
+    "@types/node": "^15.6.0",
     "@types/react": "^17.0.6",
     "@types/react-dom": "^17.0.5",
     "@typescript-eslint/eslint-plugin": "^4.24.0",