Bump nesbot/carbon from 3.8.2 to 3.8.4 (#18)

Bumps [nesbot/carbon](https://github.com/CarbonPHP/carbon) from 3.8.2 to 3.8.4.
- [Release notes](https://github.com/CarbonPHP/carbon/releases)
- [Commits](CarbonPHP/carbon@3.8.2...3.8.4)

---
updated-dependencies:
- dependency-name: nesbot/carbon
  dependency-type: indirect
...

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

Author: dependabot[bot]