Add support for Symfony 6

Author: andrewmy

composer.json

@@ -9,15 +9,15 @@
         "php": "^7.3|^8.0",
         "enqueue/enqueue": "^0.10",
         "queue-interop/queue-interop": "^0.8",
-        "symfony/event-dispatcher": "^4.3|^5"
+        "symfony/event-dispatcher": "^4.3|^5|^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
-        "symfony/dependency-injection": "^4.3|^5",
-        "symfony/config": "^4.3|^5",
-        "symfony/http-kernel": "^4.3|^5",
-        "symfony/filesystem": "^4.3|^5",
-        "symfony/yaml": "^4.3|^5",
+        "symfony/dependency-injection": "^4.3|^5|^6.0",
+        "symfony/config": "^4.3|^5|^6.0",
+        "symfony/http-kernel": "^4.3|^5|^6.0",
+        "symfony/filesystem": "^4.3|^5|^6.0",
+        "symfony/yaml": "^4.3|^5|^6.0",
         "enqueue/null": "0.10.x-dev",
         "enqueue/fs": "0.10.x-dev",
         "enqueue/test": "0.10.x-dev"