Bump System.CommandLine from 2.0.6 to 2.0.7 (#251)

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Updated [System.CommandLine](https://github.com/dotnet/dotnet) from
2.0.6 to 2.0.7.

<details>
<summary>Release notes</summary>

_Sourced from [System.CommandLine's
releases](https://github.com/dotnet/dotnet/releases)._

No release notes found for this version range.

Commits viewable in [compare
view](https://github.com/dotnet/dotnet/commits).
</details>

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Directory.Packages.props

@@ -23,7 +23,7 @@
     <PackageVersion Include="PocketLogger" Version="0.11.0" />
     <PackageVersion Include="Serilog.Sinks.RollingFileAlternate" Version="2.0.9" />
     <PackageVersion Include="Serilog" Version="4.3.1" />
-    <PackageVersion Include="System.CommandLine" Version="2.0.6" />
+    <PackageVersion Include="System.CommandLine" Version="2.0.7" />
     <PackageVersion Include="System.Drawing.Common" Version="10.0.7" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />