Add .NET 9 as a target framework

Author: mauroservienti

src/ServiceComposer.AspNetCore.Testing/ServiceComposer.AspNetCore.Testing.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     </PropertyGroup>
 
     <PropertyGroup>
@@ -39,6 +39,10 @@
     <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
         <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="[8.0.0, 9.0.0)" />
     </ItemGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
+        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="[9.0.0, 10.0.0)" />
+    </ItemGroup>
 
     <ItemGroup>
         <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />