Backport PR #34718 on branch 1.0.x (Removed __div__ impls)
https://github.com/pandas-dev/pandas/pull/34711#issuecomment-644148383


@WillAyd on 1.0.x. we have  cython>=0.29.13 and on master cython>=0.29.16. is this an issue?

> @WillAyd on 1.0.x. we have cython>=0.29.13 and on master cython>=0.29.16. is this an issue?

this was done in #33334, don't think it's sensible to bump cython on a patch release Yea seems like the PR you linked would only be needed if we were also back porting #33220 but don't think that's the case. So should be OK to not touch Cython version