chore(deps-dev): bump codeigniter/coding-standard from 1.8.7 to 1.8.8

Bumps [codeigniter/coding-standard](https://github.com/CodeIgniter/coding-standard) from 1.8.7 to 1.8.8.
- [Release notes](https://github.com/CodeIgniter/coding-standard/releases)
- [Changelog](https://github.com/CodeIgniter/coding-standard/blob/develop/CHANGELOG.md)
- [Commits](CodeIgniter/coding-standard@v1.8.7...v1.8.8)

---
updated-dependencies:
- dependency-name: codeigniter/coding-standard
  dependency-version: 1.8.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]