updated event-dispatcher version conststraint

Author: detain

composer.json

@@ -22,7 +22,7 @@
 		"php": ">=5.3.0",
 		"pear/xml_rpc2": "*",
 		"ext-curl": "*",
-		"symfony/event-dispatcher": "5.0.x-dev",
+		"symfony/event-dispatcher": "^5.0@stable",
 		"detain/myadmin-plugin-installer": "dev-master",
 		"detain/cloudlinux-licensing": "dev-master"
 	},