Bump pest from 2.8.3 to 2.8.4

Bumps [pest](https://github.com/pest-parser/pest) from 2.8.3 to 2.8.4.
- [Release notes](https://github.com/pest-parser/pest/releases)
- [Commits](pest-parser/pest@v2.8.3...v2.8.4)

---
updated-dependencies:
- dependency-name: pest
  dependency-version: 2.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]