Bump cookiejar and docpad

Removes [cookiejar](https://github.com/bmeck/node-cookiejar). It's no longer used after updating ancestor dependency [docpad](https://github.com/docpad/docpad). These dependencies need to be updated together.


Removes `cookiejar`

Updates `docpad` from 6.79.4 to 6.83.2
- [Changelog](https://github.com/docpad/docpad/blob/master/HISTORY.md)
- [Commits](docpad/docpad@v6.79.4...v6.83.2)

---
updated-dependencies:
- dependency-name: cookiejar
  dependency-type: indirect
- dependency-name: docpad
  dependency-type: direct:production
...

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