chore(deps): bump php-cs-fixer requirement minor version

Author: phil-davis

composer.json

@@ -13,7 +13,7 @@
         "sabre/uri"    : "^2.3 || ^3.0"
     },
     "require-dev" : {
-        "friendsofphp/php-cs-fixer": "^3.87",
+        "friendsofphp/php-cs-fixer": "^3.91",
         "phpstan/phpstan": "^1.12",
         "phpstan/phpstan-phpunit": "^1.4",
         "phpstan/phpstan-strict-rules": "^1.6",