remove unused dep in example

Author: RomeroYang

example/pubspec.lock

@@ -65,14 +65,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
-  cupertino_icons:
-    dependency: "direct main"
-    description:
-      name: cupertino_icons
-      sha256: a937da4c006989739ceb4d10e3bd6cce64ca85d0fe287fc5b2b9f6ee757dcee6
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.1.3"
   decimal:
     dependency: transitive
     description:
@@ -321,7 +313,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.5.3"
+    version: "0.5.4+1"
   process:
     dependency: transitive
     description:

example/pubspec.yaml

@@ -25,10 +25,6 @@ dependencies:
     sdk: flutter
 
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.3
-
 dev_dependencies:
   polkawallet_sdk:
     path: ../