Update minimum required version in portainer.json

Author: qiaofeng1227

portainer.json

@@ -5,7 +5,7 @@
     "Description": "200 application template for you installation.",
     "Version": "0.1.4-rc1",
     "Requires at most": "1.8.20",
-    "Requires at least": "0.7.2",
+    "Requires at least": "0.7.3",
     "Author": "Websoft9 Inc",
     "Author URI": "https://www.websoft9.com/",
     "License": "GPL v2 or later",