Remove unneeded Microsoft.Net.Build.Containers package

Author: bording

samples/hosting/docker/Core_9/Sender/Sender.csproj

@@ -14,7 +14,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Net.Build.Containers" Version="8.*" />
     <PackageReference Include="NServiceBus.Extensions.Hosting" Version="3.*" />
     <PackageReference Include="NServiceBus.RabbitMQ" Version="9.*" />
     <PackageReference Include="RabbitMQ.Client" Version="6.*" />