STYLE: incondintent namaspace(series)
- [x] xref #39992
- [ ] tests added / passed
- [ ] 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

Some tests is failing, but I think these tests is not relevant to this change same to #40058. Thanks @na2shell - yes, the failures from tests/extension are unrelated