Bump CommandLineParser from 2.8.0 to 2.9.1 (#31)

Bumps [CommandLineParser](https://github.com/commandlineparser/commandline) from 2.8.0 to 2.9.1.
- [Release notes](https://github.com/commandlineparser/commandline/releases)
- [Changelog](https://github.com/commandlineparser/commandline/blob/master/CHANGELOG.md)
- [Commits](commandlineparser/commandline@2.8.0...v2.9.1)

---
updated-dependencies:
- dependency-name: CommandLineParser
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Packages.props

@@ -1,6 +1,6 @@
 <Project>
   <ItemGroup>
-    <PackageReference Update="CommandLineParser" Version="2.8.0" />
+    <PackageReference Update="CommandLineParser" Version="2.9.1" />
     <PackageReference Update="log4net" Version="2.0.14" />
     <PackageReference Update="Microsoft.Build" Version="16.11.0" />
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.2.0" />