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

@@ -20,7 +20,7 @@
         "nikic/php-parser": "^4.19.2 || ^5.6.2",
         "phpstan/phpstan-phpunit": "^2.0.16",
         "phpunit/phpunit": "^13.0.5",
-        "slam/php-cs-fixer-extensions": "^3.14.0"
+        "slam/php-cs-fixer-extensions": "^3.15.0"
     },
     "autoload": {
         "psr-4": {