Update dependency slam/php-cs-fixer-extensions to ^3.15.0

| datasource | package                      | from   | to     |
| ---------- | ---------------------------- | ------ | ------ |
| packagist  | slam/php-cs-fixer-extensions | 3.14.0 | 3.15.0 |

Author: renovate[bot]

composer.json

@@ -33,7 +33,7 @@
         "phpstan/phpstan-deprecation-rules": "^2.0.4",
         "phpstan/phpstan-phpunit": "^2.0.16",
         "phpunit/phpunit": "^11.5.55",
-        "slam/php-cs-fixer-extensions": "^3.14.0"
+        "slam/php-cs-fixer-extensions": "^3.15.0"
     },
     "conflict": {
         "laminas/laminas-filter": "<2.41",