Update symfony/dependency-injection requirement from ^5 to ^6

Updates the requirements on [symfony/dependency-injection](https://github.com/symfony/dependency-injection) to permit the latest version.
- [Release notes](https://github.com/symfony/dependency-injection/releases)
- [Changelog](https://github.com/symfony/dependency-injection/blob/7.0/CHANGELOG.md)
- [Commits](symfony/dependency-injection@v5.0.0...v6.4.6)

---
updated-dependencies:
- dependency-name: symfony/dependency-injection
  dependency-type: direct:production
...

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

composer.json

@@ -21,7 +21,7 @@
     "vlucas/phpdotenv": "^5",
     "haydenpierce/class-finder": "^0.4.3",
     "doctrine/orm": "^2.12",
-    "symfony/dependency-injection": "^5",
+    "symfony/dependency-injection": "^6",
     "symfony/cache": "^v3.4",
     "nette/php-generator": "^3.6",
     "adhocore/cli": "^0.9.0",