Bump stylelint-config-primer from 2.2.11 to 3.0.0

Bumps [stylelint-config-primer](https://github.com/primer/primer) from 2.2.11 to 3.0.0.
- [Release notes](https://github.com/primer/primer/releases)
- [Changelog](https://github.com/primer/primer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/primer/primer/commits/v3.0.0

)

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