Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

src/dotnet/Directory.Packages.props

@@ -9,7 +9,7 @@
     <!-- Test-only -->
     <ItemGroup>
         <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.20"/>
-        <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1"/>
+        <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1"/>
         <PackageVersion Include="xunit" Version="2.9.3"/>
         <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2"/>
         <PackageVersion Include="coverlet.collector" Version="3.2.0"/>