[release/10.0.1xx-rc.1] Update Messaging to 18.0.280-ga047b642b9 (#23655)

Applied fixes:


https://dev.azure.com/devdiv/DevDiv/_git/ClientTools.Platform/pullrequest/663026


https://dev.azure.com/devdiv/DevDiv/_git/ClientTools.Platform/pullrequest/663383

Author: mauroa

msbuild/Directory.Build.props

@@ -15,7 +15,7 @@
 			https://dev.azure.com/azure-public/vside/_artifacts/feed/xamarin-impl/NuGet/Xamarin.Messaging.Client/
 
 		-->
-		<MessagingVersion Condition="'$(MessagingVersion)' == ''">[18.0.274-g7916b06962]</MessagingVersion>
+		<MessagingVersion Condition="'$(MessagingVersion)' == ''">[18.0.280-ga047b642b9]</MessagingVersion>
 		<HotRestartVersion>[17.14.133-g001ce2ac7a]</HotRestartVersion>
 	</PropertyGroup>
 	<Import Project="$(MSBuildThisFileDirectory)../Directory.Build.props" />