Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

src/UnitTests/UnitTests.csproj

@@ -21,7 +21,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="7.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />