Bump tough-cookie and docpad-plugin-less

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


Removes `tough-cookie`

Updates `docpad-plugin-less` from 2.5.1 to 2.10.0
- [Changelog](https://github.com/docpad/docpad-plugin-less/blob/master/HISTORY.md)
- [Commits](docpad/docpad-plugin-less@v2.5.1...v2.10.0)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: docpad-plugin-less
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>