Handle `grok_number` changes in recent Perl

Recent blead Perls have deliberately started accepting case variants of `1.#INF` and `1.#IND`. That change causes test failures in Scalar::Util::Numeric. This pull request therefore deletes the affected tests.

For more information, please see this ticket (or feel free to ask me):

https://rt.perl.org/Ticket/Display.html?id=122843

Thanks.