chore(deps-dev): bump textual-dev from 1.4.0 to 1.5.1 (#480)

Bumps [textual-dev](https://github.com/Textualize/textual-dev) from 1.4.0 to 1.5.1.
- [Release notes](https://github.com/Textualize/textual-dev/releases)
- [Commits](Textualize/textual-dev@v1.4.0...v1.5.1)

---
updated-dependencies:
- dependency-name: textual-dev
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>