ci: bump prettier from 3.8.3 to 3.8.4 in the default group

Bumps the default group with 1 update: [prettier](https://github.com/prettier/prettier).


Updates `prettier` from 3.8.3 to 3.8.4
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.8.3...3.8.4)

---
updated-dependencies:
- dependency-name: prettier
  dependency-version: 3.8.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: default
...

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Author: dependabot[bot]