Bump @types/node from 15.3.1 to 15.6.0 (#14)

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>

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

Author: dependabot[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "@types/bull": "^3.15.1",
     "@types/express": "4.17.11",
     "@types/jest": "26.0.23",
-    "@types/node": "15.3.1",
+    "@types/node": "15.6.0",
     "@types/passport-jwt": "^3.0.5",
     "@types/passport-local": "^1.0.33",
     "@types/supertest": "2.0.11",