Update System.CommandLine to beta 3

Author: jnm2

src/TfvcMigrator/TfvcMigrator.csproj

@@ -23,8 +23,8 @@
   <ItemGroup>
     <PackageReference Include="LibGit2Sharp" Version="0.27.0-preview-0175" />
     <PackageReference Include="Microsoft.TeamFoundationServer.Client" Version="16.170.0" />
-    <PackageReference Include="System.CommandLine" Version="2.0.0-beta2.21617.1" />
-    <PackageReference Include="System.CommandLine.NamingConventionBinder" Version="2.0.0-beta2.21617.1" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta3.22114.1" />
+    <PackageReference Include="System.CommandLine.NamingConventionBinder" Version="2.0.0-beta3.22114.1" />
     <PackageReference Include="TaskTupleAwaiter" Version="2.0.0" />
   </ItemGroup>