fix: Update default branch at workflow

Author: sanny32

.github/workflows/build-dmg-qt6-macos.yml

@@ -9,7 +9,7 @@ on:
       branch:
         description: 'Checkout branch'
         required: false
-        default: 'dev'
+        default: 'release/1.x'
       tag:
         description: 'Checkout tag'
         required: false