MauiSample: add .NET 9 target frameworks

Author: janusw

MauiSample/MauiSample.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
-		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks>
+		<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst;net9.0-android;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
+		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0;net9.0-windows10.0.19041.0</TargetFrameworks>
 		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
 		<!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->
 		<OutputType>Exe</OutputType>
@@ -31,7 +31,7 @@
 		<ProvisioningType>automatic</ProvisioningType>
 	</PropertyGroup>
 
-	<PropertyGroup Condition="'$(TargetFramework)'=='net8.0-ios'">
+	<PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">
 	  <CodesignKey>Apple Development: Created via API (K8Q3S2AN24)</CodesignKey>
 	  <CodesignProvision>VS: WildCard Development</CodesignProvision>
 	</PropertyGroup>