Updated test nuget packages

Author: ThomasArdal

test/Elmah.Io.Client.Extensions.Correlation.Test/Elmah.Io.Client.Extensions.Correlation.Test.csproj

@@ -1,17 +1,18 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-	<PropertyGroup>
-		<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
-	</PropertyGroup>
+  <PropertyGroup>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+    <LangVersion>12.0</LangVersion>
+  </PropertyGroup>
 
-	<ItemGroup>
-	  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-	  <PackageReference Include="NUnit" Version="4.1.0" />
-	  <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-	</ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+  </ItemGroup>
 
-	<ItemGroup>
-	  <ProjectReference Include="..\..\src\Elmah.Io.Client.Extensions.Correlation\Elmah.Io.Client.Extensions.Correlation.csproj" />
-	</ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Elmah.Io.Client.Extensions.Correlation\Elmah.Io.Client.Extensions.Correlation.csproj" />
+  </ItemGroup>
 
 </Project>