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

Author: renovate[bot]

DopplerCustomDomain.Test/DopplerCustomDomain.Test.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1" />
     <PackageReference Include="coverlet.collector" Version="8.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.20" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageReference Include="xunit" Version="2.9.3" />