Bump System.CommandLine from 2.0.5 to 2.0.6 (#998)

Updated [System.CommandLine](https://github.com/dotnet/dotnet) from
2.0.5 to 2.0.6.

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Directory.Packages.props

@@ -54,7 +54,7 @@
     <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview.4" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Moq.AutoMock" Version="4.0.2" />
-    <PackageVersion Include="System.CommandLine" Version="2.0.5" />
+    <PackageVersion Include="System.CommandLine" Version="2.0.6" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageVersion Include="Octokit" Version="14.0.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.2" />