Update branch-alias to 3.x-dev (#245)

Author: github-actions[bot]

composer.json

@@ -32,7 +32,7 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-main": "2.x-dev"
+      "dev-main": "3.x-dev"
     },
     "bundled": true,
     "commands": [