.NET for Android error/warning XA4313

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The specified Framework assembly has been deprecated. You need an upgrade to use the specified NuGet Package.

For example, to upgrade OpenTK-1.0 remove

<Reference Include="OpenTK-1.0" />

from your csproj then add

<PackageReference Include="Xamarin.Legacy.OpenTK" Version="1.0.0" />

to your project to upgrade.