Bump nesbot/carbon from 2.72.1 to 2.72.6

Bumps [nesbot/carbon](https://github.com/CarbonPHP/carbon) from 2.72.1 to 2.72.6.
- [Release notes](https://github.com/CarbonPHP/carbon/releases)
- [Commits](CarbonPHP/carbon@2.72.1...2.72.6)

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

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