Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

test/DotnetDispatcher.Tests/DotnetDispatcher.Tests.csproj

@@ -14,7 +14,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
 		<PackageReference Include="System.Net.Http" Version="4.3.4" />
 		<PackageReference Include="xunit" Version="2.9.3" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="3.0.1">