Update dependency System.CommandLine to 2.0.0-beta6.25358.103

Author: dependencyupdates[bot]

src/NServiceBus.Transport.RabbitMQ.CommandLine/NServiceBus.Transport.RabbitMQ.CommandLine.csproj

@@ -19,7 +19,7 @@
   <ItemGroup>
     <PackageReference Include="NServiceBus" Version="10.0.0-alpha.1" />
     <PackageReference Include="RabbitMQ.Client" Version="7.1.2" />
-    <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta6.25358.103" />
   </ItemGroup>
 
   <ItemGroup>