Build(deps-dev): Bump ergebnis/php-cs-fixer-config from 1.1.3 to 2.1.2

Bumps [ergebnis/php-cs-fixer-config](https://github.com/ergebnis/php-cs-fixer-config) from 1.1.3 to 2.1.2.
- [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@1.1.3...2.1.2)

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

composer.json

@@ -20,7 +20,7 @@
     "require-dev": {
         "ergebnis/composer-normalize": "^2.1.1",
         "ergebnis/license": "^1.0.0",
-        "ergebnis/php-cs-fixer-config": "~1.1.2",
+        "ergebnis/php-cs-fixer-config": "~2.1.2",
         "phpspec/prophecy": "^1.7.0",
         "phpunit/phpunit": "^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0"
     },