chore(deps): remove unused packages NetEvolve.Extensions.XUnit and Polyfill (#498)

Author: samtrion

Directory.Packages.props

@@ -16,8 +16,6 @@
   <ItemGroup>
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.3.2" />
     <PackageVersion Include="NetEvolve.Extensions.TUnit" Version="3.5.3" />
-    <PackageVersion Include="NetEvolve.Extensions.XUnit" Version="2.7.59" />
-    <PackageVersion Include="Polyfill" Version="9.7.0" />
     <PackageVersion Include="TUnit" Version="1.9.68" />
     <PackageVersion Include="Verify.TUnit" Version="31.9.3" />
   </ItemGroup>