Bump System.CommandLine from 2.0.3 to 2.0.4 (#917)

Updated [System.CommandLine](https://github.com/dotnet/dotnet) from
2.0.3 to 2.0.4.

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Directory.Packages.props

@@ -48,7 +48,7 @@
     <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview.4" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Moq.AutoMock" Version="3.6.1" />
-    <PackageVersion Include="System.CommandLine" Version="2.0.3" />
+    <PackageVersion Include="System.CommandLine" Version="2.0.4" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageVersion Include="Octokit" Version="14.0.0" />
     <PackageVersion Include="DotnetSitemapGenerator" Version="2.0.0" />