CLN: enforce deprecation `resample` with `PeriodIndex`
enforced deprecation of `resample` with `PeriodIndex`


I have a Pr that does this, but it is on hold bc a handful of people are asking us to reconsider the deprecation > I have a Pr that does this, but it is on hold bc a handful of people are asking us to reconsider the deprecation

thanks, I understand. I'll close this PR.