Add allowed plugins (#40246)

Author: driesvints

composer.json

@@ -155,7 +155,10 @@
         "wildbit/swiftmailer-postmark": "Required to use Postmark mail driver (^3.0)."
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "composer/package-versions-deprecated": true
+        }
     },
     "minimum-stability": "dev",
     "prefer-stable": true