Bump laravel/sail from 1.21.3 to 1.21.4

Bumps [laravel/sail](https://github.com/laravel/sail) from 1.21.3 to 1.21.4.
- [Release notes](https://github.com/laravel/sail/releases)
- [Changelog](https://github.com/laravel/sail/blob/1.x/CHANGELOG.md)
- [Commits](laravel/sail@v1.21.3...v1.21.4)

---
updated-dependencies:
- dependency-name: laravel/sail
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]