dotnet: Update all major dependencies

Author: Renovate Bot

dotnet/Vaas/test/Vaas.Test/Vaas.Test.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="DotNetEnv" Version="3.1.1" />
     <PackageReference Include="FluentAssertions" Version="8.1.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="Moq.Contrib.HttpClient" Version="1.4.0" />
     <PackageReference Include="Snapshooter.Xunit" Version="1.0.1" />
     <PackageReference Include="xunit" Version="2.9.3" />