Bump github.com/gruntwork-io/terragrunt from 0.36.9 to 0.68.13

Bumps [github.com/gruntwork-io/terragrunt](https://github.com/gruntwork-io/terragrunt) from 0.36.9 to 0.68.13.
- [Release notes](https://github.com/gruntwork-io/terragrunt/releases)
- [Commits](gruntwork-io/terragrunt@v0.36.9...v0.68.13)

---
updated-dependencies:
- dependency-name: github.com/gruntwork-io/terragrunt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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