Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

src/Cake.Npm.Tests/Cake.Npm.Tests.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="Cake.Core" Version="5.0.0" />
     <PackageReference Include="Cake.Testing" Version="5.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.0" />
     <PackageReference Include="Shouldly" Version="4.3.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />