Merge pull request #3 from SowntharyaJ/master

Changed Sample Target Version to Latest .NET9 Target Version.

Author: PiruthivirajM

ChatApplication/ChatApplication/App.xaml.cs

@@ -9,7 +9,7 @@ public App()
 
         protected override Window CreateWindow(IActivationState? activationState)
         {
-            return new Window(new AppShell());
+            return new Window(new MainPage());
         }
     }
 }

ChatApplication/ChatApplication/AppShell.xaml

@@ -60,7 +60,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Maui.Controls" Version="9.0.21" />
+		<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
 		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />
 		<PackageReference Include="Syncfusion.Maui.ListView" Version="*" />
 	</ItemGroup>