Bump laravel/tinker from 2.8.0 to 2.8.1

Bumps [laravel/tinker](https://github.com/laravel/tinker) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/laravel/tinker/releases)
- [Changelog](https://github.com/laravel/tinker/blob/2.x/CHANGELOG.md)
- [Commits](laravel/tinker@v2.8.0...v2.8.1)

---
updated-dependencies:
- dependency-name: laravel/tinker
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]