Bump textual from 7.4.0 to 8.0.0 (#52)

Bumps [textual](https://github.com/Textualize/textual) from 7.4.0 to 8.0.0.
- [Release notes](https://github.com/Textualize/textual/releases)
- [Changelog](https://github.com/Textualize/textual/blob/main/CHANGELOG.md)
- [Commits](Textualize/textual@v7.4.0...v8.0.0)

---
updated-dependencies:
- dependency-name: textual
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]