bump manifest version to 5.4.1-alpha.3

Author: krahabb

custom_components/meross_lan/manifest.json

@@ -19,5 +19,5 @@
     "/appliance/+/publish"
   ],
   "requirements": [],
-  "version": "5.4.1-alpha.2"
+  "version": "5.4.1-alpha.3"
 }