Ellipsis not collable error using mypy

[farnsworth]

When using vectorized string methods, mypy returns the following error:
error: "ellipsis" not callable
Looking at the source code I see that in pandas-stubs/core/strings.pyi there is:

    len = ...
    lower = ...
    upper = ...
    title = ...
    capitalize = ...

To Reproduce

import pandas
pandas.Series(["hello"]).str.len()

If I run mypy on this code I get:
error: "ellipsis" not callable

Versions

• Python 3.10.4
• mypy 0.971
• pandas-stubs 1.4.3.220718

[bashtage]

Need types to avoid inference. A PR would be great.