Bump laravel/lumen-framework from 5.8.12 to 5.8.13

Bumps [laravel/lumen-framework](https://github.com/laravel/lumen-framework) from 5.8.12 to 5.8.13.
- [Release notes](https://github.com/laravel/lumen-framework/releases)
- [Commits](laravel/lumen-framework@v5.8.12...v5.8.13)

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