chore: 4.2 branch alias

Author: soyuka

composer.json

@@ -85,7 +85,8 @@
             ]
         },
         "branch-alias": {
-            "dev-main": "4.2.x-dev",
+            "dev-main": "4.3.x-dev",
+            "dev-4.2": "4.2.x-dev",
             "dev-3.4": "3.4.x-dev",
             "dev-4.1": "4.1.x-dev"
         },