Bump @types/node from 15.3.1 to 15.6.0

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 15.3.1 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>

package.json

@@ -37,7 +37,7 @@
         "uuid": "^8.3.2"
     },
     "devDependencies": {
-        "@types/node": "^15.3.1",
+        "@types/node": "^15.6.0",
         "@types/q": "^1.5.4",
         "@types/semver-compare": "^1.0.1",
         "@types/uuid": "^8.3.0",