 CLN: convert argument in .take method
- [x] xref #6581
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

so i think we can collapse _take back into take; it was split out to be the internal take to accomdate this deprecation. can be a separate PR if u want (make an issue though) Created https://github.com/pandas-dev/pandas/issues/27174 for the follow up consolidation.