Update package version to 3.0.0
Update package version to 3.0.0

This doesn't make much practical difference since CoreCLR's packages aren't
intended for any consumers other than core-setup, but we might as well try
to be consistent with our peer repos in case it provides a useful hint when
something goes wrong.

poizan42/coreclr,poizan42/coreclr,krk/coreclr,wtgodbe/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,krk/coreclr,poizan42/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,cshung/coreclr,mmitche/coreclr,wtgodbe/coreclr,mmitche/coreclr,cshung/coreclr,mmitche/coreclr,krk/coreclr,krk/coreclr,cshung/coreclr,wtgodbe/coreclr,mmitche/coreclr,mmitche/coreclr,krk/coreclr,poizan42/coreclr,wtgodbe/coreclr