ty fixed issue with `Protocol`

[Dr-Irv]

pandas-stubs/pandas-stubs/core/groupby/generic.pyi

Line 218 in 67a1748

# ty ignore needed because of https://github.com/astral-sh/ty/issues/157#issuecomment-3017337945

Based on astral-sh/ty#157 being closed, ty may do a release that fixes the above.