Bump yn from 4.0.0 to 5.1.0 in /plugins/cad-backend

Bumps [yn](https://github.com/sindresorhus/yn) from 4.0.0 to 5.1.0.
- [Release notes](https://github.com/sindresorhus/yn/releases)
- [Commits](sindresorhus/yn@v4.0.0...v5.1.0)

---
updated-dependencies:
- dependency-name: yn
  dependency-version: 5.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

plugins/cad-backend/package.json

@@ -36,7 +36,7 @@
     "express-promise-router": "^4.1.0",
     "node-fetch": "^2.6.7",
     "request": "^2.88.2",
-    "yn": "^4.0.0"
+    "yn": "^5.1.0"
   },
   "devDependencies": {
     "@backstage/cli": "^0.26.6",