build(deps): bump shelljs and standard in /plugin

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


Removes `shelljs`

Updates `standard` from 8.6.0 to 17.0.0
- [Release notes](https://github.com/standard/standard/releases)
- [Changelog](https://github.com/standard/standard/blob/master/CHANGELOG.md)
- [Commits](standard/standard@v8.6.0...v17.0.0)

---
updated-dependencies:
- dependency-name: shelljs
  dependency-type: indirect
- dependency-name: standard
  dependency-type: direct:development
...

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

Author: dependabot[bot]