Bump tough-cookie and less in /PolyDeploy

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependency [less](https://github.com/less/less.js). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `less` from 2.7.3 to 4.1.3
- [Release notes](https://github.com/less/less.js/releases)
- [Changelog](https://github.com/less/less.js/blob/master/CHANGELOG.md)
- [Commits](less/less.js@v2.7.3...v4.1.3)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: less
  dependency-type: direct:development
...

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

PolyDeploy/package.json

@@ -24,7 +24,7 @@
     "gulp": "^4.0.2",
     "gulp-clean": "^0.4.0",
     "gulp-zip": "^5.0.2",
-    "less": "^2.7.3",
+    "less": "^4.1.3",
     "less-loader": "^4.0.5",
     "merge-stream": "^1.0.1",
     "raw-loader": "^0.5.1",