Bump node-fetch from 2.6.0 to 2.6.1 in /chapter-13/controllers

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)
- [Commits](node-fetch/node-fetch@v2.6.0...v2.6.1)

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

Author: dependabot[bot]

chapter-13/controllers/package-lock.json

@@ -12,7 +12,7 @@
     "hbs": "~4.0.4",
     "http-errors": "~1.6.3",
     "morgan": "~1.9.1",
-    "node-fetch": "^2.6.0",
+    "node-fetch": "^2.6.1",
     "node-persist": "^3.0.5",
     "supervisor": "^0.12.0"
   }