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

Bumps [ergebnis/php-cs-fixer-config](https://github.com/ergebnis/php-cs-fixer-config) from 6.26.0 to 6.28.0.
- [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@6.26.0...6.28.0)

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

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

composer.json

@@ -37,7 +37,7 @@
     "ext-pdo_sqlite": "*",
     "ergebnis/composer-normalize": "^2.42.0",
     "ergebnis/license": "^2.4.0",
-    "ergebnis/php-cs-fixer-config": "^6.26.0",
+    "ergebnis/php-cs-fixer-config": "^6.28.0",
     "ergebnis/phpstan-rules": "^2.2.0",
     "ergebnis/phpunit-slow-test-detector": "^2.14.0",
     "infection/infection": "~0.27.11",