Allow v3 contracts where possible

Author: derrabus

composer.json

@@ -19,11 +19,11 @@
         "php": ">=7.2.5",
         "doctrine/event-manager": "~1.0",
         "doctrine/persistence": "^2",
-        "symfony/deprecation-contracts": "^2.1",
+        "symfony/deprecation-contracts": "^2.1|^3",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php80": "^1.16",
-        "symfony/service-contracts": "^1.1|^2"
+        "symfony/service-contracts": "^1.1|^2|^3"
     },
     "require-dev": {
         "composer/package-versions-deprecated": "^1.8",