chore(deps-dev): bump codeigniter/coding-standard from 1.8.3 to 1.8.4 (#480)

Bumps [codeigniter/coding-standard](https://github.com/CodeIgniter/coding-standard) from 1.8.3 to 1.8.4.
- [Release notes](https://github.com/CodeIgniter/coding-standard/releases)
- [Changelog](https://github.com/CodeIgniter/coding-standard/blob/develop/CHANGELOG.md)
- [Commits](CodeIgniter/coding-standard@v1.8.3...v1.8.4)

---
updated-dependencies:
- dependency-name: codeigniter/coding-standard
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]