[deps]: Update Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

test/Billing.Test/Billing.Test.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="[17.14.0]" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="[18.0.0]" />
     <PackageReference Include="xunit" Version="[2.9.3]" />
     <PackageReference Include="xunit.runner.visualstudio" Version="[3.1.0]">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>