Bump smarty/smarty from 5.5.2 to 5.6.0

Bumps [smarty/smarty](https://github.com/smarty-php/smarty) from 5.5.2 to 5.6.0.
- [Release notes](https://github.com/smarty-php/smarty/releases)
- [Changelog](https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md)
- [Commits](smarty-php/smarty@v5.5.2...v5.6.0)

---
updated-dependencies:
- dependency-name: smarty/smarty
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]