pd.Index().shift() claims to return None

[gogowitsch]

Describe the bug
The stubs claim that shift returns None, when it returns a pd.Index of the same type as the original_index

To Reproduce

from datetime import datetime

import pandas as pd

original_index = pd.date_range(
    start=datetime(2024, 2, 2),
    end=datetime(2024, 4, 2),
    freq="15min",
    inclusive="left",
    tz="Europe/Berlin",
)

new_index = original_index.shift(1)
print(original_index, new_index)
print(f"{type(original_index)}, {type(new_index)}")

I get this mypy error:

example.py:13: error: "shift" of "Index" does not return a value (it only ever returns None) [func-returns-value]

Please complete the following information:

• macOS 15.4 (24E248)
• Python 3.11.11
• I am using mypy 1.11.1 and pandas-stubs 2.2.3.250308.

[Dr-Irv]

Thanks for the report. PR with tests welcome