composer(deps-dev): Bump ergebnis/php-cs-fixer-config

Bumps [ergebnis/php-cs-fixer-config](https://github.com/ergebnis/php-cs-fixer-config) from 5.5.2 to 5.6.0.
- [Release notes](https://github.com/ergebnis/php-cs-fixer-config/releases)
- [Changelog](https://github.com/ergebnis/php-cs-fixer-config/blob/main/CHANGELOG.md)
- [Commits](ergebnis/php-cs-fixer-config@5.5.2...5.6.0)

---
updated-dependencies:
- dependency-name: ergebnis/php-cs-fixer-config
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

composer.json

@@ -29,7 +29,7 @@
     "ergebnis/composer-normalize": "^2.31.0",
     "ergebnis/data-provider": "^1.3.0",
     "ergebnis/license": "^2.1.0",
-    "ergebnis/php-cs-fixer-config": "^5.5.2",
+    "ergebnis/php-cs-fixer-config": "^5.6.0",
     "fakerphp/faker": "^1.22.0",
     "psalm/plugin-phpunit": "~0.18.4",
     "rector/rector": "~0.16.0",