pandas==1.4.0rc0 FilePathOrBuffer deprecation breaks modin import

[jeffreykennethli]

System information

• OS Platform and Distribution: Mac 12.0.1
• Modin version (modin.__version__): 0.12.0 - pandas==1.4.0rc0 pre-release
• Python version: 3.8.8
• Code we can use to reproduce:

python -m pip install --upgrade --pre pandas==1.4.0rc0
ipython

# (in ipython)
import modin.pandas as pd

# throws error:
# cannot import name 'FilePathOrBuffer' from 'pandas._typing' (/Users/jeffreyli/opt/anaconda3/lib/python3.8/site-packages/pandas/_typing.py)

Describe the problem

The Class FilePathOrBuffer no longer exists in pandas typing, after this PR pandas-dev/pandas#43951.

[jeffreykennethli]

This is also caught by our CI in a workflow run that tests the pre-release candidate: https://github.com/modin-project/modin/actions/runs/1690328476, in PR #3914.

[anmyachev]

We have already updated pandas dependency to 1.4.1.