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

Bumps [ergebnis/php-cs-fixer-config](https://github.com/ergebnis/php-cs-fixer-config) from 5.15.1 to 6.0.0.
- [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@5.15.1...6.0.0)

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

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

composer.json

@@ -26,7 +26,7 @@
   "require-dev": {
     "ergebnis/composer-normalize": "^2.37.0",
     "ergebnis/license": "^2.2.0",
-    "ergebnis/php-cs-fixer-config": "~5.15.1",
+    "ergebnis/php-cs-fixer-config": "~6.0.0",
     "ergebnis/phpunit-slow-test-detector": "^2.3.0",
     "infection/infection": "~0.27.2",
     "phpunit/phpunit": "^10.3.4",