Series().rename(..., inplace=True) can return a Series if the renamer is hashable

[loicdiridollou]

Series.rename inplace can actually return Self and not None see pandas-dev/pandas#60942
The current typehinting would force it to be None but at runtime this does not seem to stand.

>>> import pandas as pd
>>> pd.Series([1, 2, 3]).rename("A", inplace=True)
0    1
1    2
2    3
Name: A, dtype: int64