Bump formidable and href-content

Removes [formidable](https://github.com/node-formidable/formidable). It's no longer used after updating ancestor dependency [href-content](https://github.com/jonkemp/inline-css). These dependencies need to be updated together.


Removes `formidable`

Updates `href-content` from 2.0.1 to 2.0.3
- [Release notes](https://github.com/jonkemp/inline-css/releases)
- [Commits](https://github.com/jonkemp/inline-css/commits)

---
updated-dependencies:
- dependency-name: formidable
  dependency-type: indirect
- dependency-name: href-content
  dependency-type: indirect
...

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