Bump branch-alias for next minor release

Author: acrobat

composer.json

@@ -43,7 +43,7 @@
     "prefer-stable": true,
     "extra": {
         "branch-alias": {
-            "dev-master": "2.12.x-dev"
+            "dev-master": "2.13.x-dev"
         }
     }
 }