STYLE: Inconsistent namespace - dtypes (pandas-dev#39992)
- [x] xref #39992 
- [ ] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Thanks @parkerashlan 