BUG: breaking type annotation of format_percentiles function in io/formats/format.py

[MarkBekooy]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

Open `io/formats/format.py` file and see that the following:

def format_percentiles(
    percentiles: (np.ndarray | Sequence[float]),
) -> list[str]:

Issue Description

The brackets of (np.ndarray | Sequence[float]) should be removed as they break the libcst parser and they are unneccesary

Expected Behavior

Removed brackets

Installed Versions

...

[rhshadrach]

Since it's valid Python, it sounds like this should also be reported to libcst.