build(deps): bump spatie/laravel-markdown from 2.2.6 to 2.4.0

Bumps [spatie/laravel-markdown](https://github.com/spatie/laravel-markdown) from 2.2.6 to 2.4.0.
- [Release notes](https://github.com/spatie/laravel-markdown/releases)
- [Changelog](https://github.com/spatie/laravel-markdown/blob/main/CHANGELOG.md)
- [Commits](spatie/laravel-markdown@2.2.6...2.4.0)

---
updated-dependencies:
- dependency-name: spatie/laravel-markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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