BUG: #57972 kurtosis small sample size low variance false positive cutoff
Not much activity in the issue #57972, but this seems to be a minor problem with the kurtosis implementation.

- [x] closes #57972 (Replace xxxx with the GitHub issue number)
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.
Closing this because the numerical issues warrant some more investigation. Seems like I am being too conservative with my cutoff here.