Updated Xamarin.Messaging to 1.9.94 (#17925)

Should fix an issue in remote builds where if the connection gets
disconnected unexpectedly, the build might end up failing because the
main session id is changed and also the reconnection fails.

More details: https://github.com/xamarin/Xamarin.Messaging/pull/587

msbuild/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 	<PropertyGroup>
-		<MessagingVersion>1.9.59</MessagingVersion>
+		<MessagingVersion>1.9.94</MessagingVersion>
 		<HotRestartVersion>1.0.93</HotRestartVersion>
 	</PropertyGroup>
 </Project>

msbuild/ILMerge.targets

@@ -72,6 +72,7 @@
     <PropertyGroup>
       <AbsoluteAssemblyOriginatorKeyFile Condition="'$(AssemblyOriginatorKeyFile)' != ''">$([System.IO.Path]::GetFullPath($([System.IO.Path]::Combine('$(MSBuildProjectDirectory)','$(AssemblyOriginatorKeyFile)'))))</AbsoluteAssemblyOriginatorKeyFile>
       <ILRepackArgs Condition="'$(AbsoluteAssemblyOriginatorKeyFile)' != ''">/keyfile:"$(AbsoluteAssemblyOriginatorKeyFile)" /delaysign</ILRepackArgs>
+	  <ILRepackArgs>$(ILRepackArgs) /union</ILRepackArgs> <!-- This is needed to merge types with identical names into one, wich happens with IFluentInterface in Merq and Merq.Core (Xamarin.Messaging dependencies) -->
       <ILRepackArgs>$(ILRepackArgs) @(LibDir -&gt; '/lib:"%(Identity)."', ' ')</ILRepackArgs>
       <ILRepackArgs>$(ILRepackArgs) /out:"@(IntermediateAssembly -&gt; '%(FullPath)')"</ILRepackArgs>
       <ILRepackArgs>$(ILRepackArgs) "@(IntermediateAssembly -&gt; '%(FullPath)')"</ILRepackArgs>