Bump the dev-dependencies group in /composer/helpers/v1 with 1 update

Bumps the dev-dependencies group in /composer/helpers/v1 with 1 update: [phpstan/phpstan](https://github.com/phpstan/phpstan).

- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.38...1.10.39)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>