Bump shelljs, eslint and eslint-config-kokarn

Removes [shelljs](https://github.com/shelljs/shelljs). It's no longer used after updating ancestor dependencies [shelljs](https://github.com/shelljs/shelljs), [eslint](https://github.com/eslint/eslint) and [eslint-config-kokarn](https://github.com/kokarn/eslint-config-kokarn). These dependencies need to be updated together.


Removes `shelljs`

Updates `eslint` from 3.19.0 to 8.33.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v8.33.0)

Updates `eslint-config-kokarn` from 2.1.1 to 5.0.6
- [Release notes](https://github.com/kokarn/eslint-config-kokarn/releases)
- [Commits](https://github.com/kokarn/eslint-config-kokarn/commits/v5.0.6)

---
updated-dependencies:
- dependency-name: shelljs
  dependency-type: indirect
- dependency-name: eslint
  dependency-type: direct:production
- dependency-name: eslint-config-kokarn
  dependency-type: direct:production
...

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