Update phpstan/phpstan-symfony requirement in the composer group

Updates the requirements on [phpstan/phpstan-symfony](https://github.com/phpstan/phpstan-symfony) to permit the latest version.

Updates `phpstan/phpstan-symfony` to 1.4.6
- [Release notes](https://github.com/phpstan/phpstan-symfony/releases)
- [Commits](phpstan/phpstan-symfony@1.4.5...1.4.6)

---
updated-dependencies:
- dependency-name: phpstan/phpstan-symfony
  dependency-type: direct:development
  dependency-group: composer
...

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

composer.json

@@ -35,7 +35,7 @@
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "1.11.7",
         "phpstan/phpstan-phpunit": "1.4.0",
-        "phpstan/phpstan-symfony": "1.4.5",
+        "phpstan/phpstan-symfony": "1.4.6",
         "phpunit/phpunit": "^8.5.14||^9.3.9",
         "symfony/browser-kit": "^4.4.20||^5.0.11||^6.0||^7.0",
         "symfony/cache": "^4.4.20||^5.0.11||^6.0||^7.0",