[Xamarin.Android.Build.Tasks] PackageReference and AndroidUseLatestPlatformSdk do not work together

Fixes https://bugzilla.xamarin.com/show_bug.cgi?id=59534

When using `PackageReference` with our system it run before
`_SetLatestTargetFrameworkVersion`. As a result it always
uses a `$(TargetFrameworkVersion)` of v2.3 or what ever the
user defined in the project manually.

So we need to make sure that `_SetLatestTargetFrameworkVersion`
runs as part of the `PackageReference` target chain. Fortunately
that chain is run as part of `ResolveAssemblyReferencesDependsOn`.
So we just need to make sure that our target in run as part of
that target chain in order to fix this issue.

Author: dellis1972

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -140,6 +140,13 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
 *******************************************
 -->
 
+<PropertyGroup>
+	<ResolveAssemblyReferencesDependsOn>
+		_SetLatestTargetFrameworkVersion;
+		$(ResolveAssemblyReferencesDependsOn)
+	</ResolveAssemblyReferencesDependsOn>
+</PropertyGroup>
+
 <PropertyGroup>
 	<GetReferenceAssemblyPathsDependsOn>
 		_SetLatestTargetFrameworkVersion;