chore(deps): update dependency microsoft.net.test.sdk to v18

Author: renovate-bot

src/cartservice/tests/cartservice.tests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="9.0.9" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>