Allow version 2 of the contracts package.

Author: derrabus

composer.json

@@ -24,7 +24,7 @@
         "symfony/event-dispatcher": "^3.4|^4.0|^5.0",
         "symfony/finder": "^3.4|^4.0|^5.0",
         "symfony/messenger": "^4.1|^5.0",
-        "symfony/service-contracts": "^1.1",
+        "symfony/service-contracts": "^1.1|^2",
         "symfony/yaml": "^3.4|^4.0|^5.0"
     },
     "conflict": {