Bump phpro/grumphp-shim from 2.12.0 to 2.13.0

Bumps [phpro/grumphp-shim](https://github.com/phpro/grumphp-shim) from 2.12.0 to 2.13.0.
- [Release notes](https://github.com/phpro/grumphp-shim/releases)
- [Commits](phpro/grumphp-shim@v2.12.0...v2.13.0)

---
updated-dependencies:
- dependency-name: phpro/grumphp-shim
  dependency-version: 2.13.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]