Update APICompat and compatibility suppression files (dotnet/runtime#…

…75447)

The latest APICompat doesn't emit compatibility differences anymore for
nint vs IntPtr and nuint vs UIntPtr. Updating to the new version to
clean-up the checked-in suppression files.

Also updating the transport package properties as APICompat now
supports multi-assembly packages. This change disables the (now
possible) use of APICompat in these projects as enabling it in a useful
way will require more work on the consumption side.

Commit migrated from dotnet/runtime@2921c2f