Bump @types/node from 14.14.20 to 15.6.1

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 14.14.20 to 15.6.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

package.json

@@ -43,7 +43,7 @@
   },
   "devDependencies": {
     "@types/jest": "^26.0.19",
-    "@types/node": "^14.0.27",
+    "@types/node": "^15.6.1",
     "@types/vinyl": "^2.0.2",
     "coveralls": "^3.0.6",
     "jest": "^26.6.3",