Cannot parse Python 3.10 keywords Eg: match

[sbalasa]

Describe the bug

Python 3.10 keywords aren't recognized

To Reproduce

Run black when match keyword is present in the file

For example:

1. Create a file sample.py having match keyword
2. Run black -l 80 sample.py
3. See error -->

error: cannot format sample.py: Cannot parse: 2:10:     match option:
Oh no! 💥 💔 💥
1 file failed to reformat.
<img width="603" alt="Screenshot 2021-10-08 at 3 07 19 AM" src="https://user-images.githubusercontent.com/4533119/136465771-59933ab9-0a8e-4fcb-a8ea-6c40ef78639f.png">

Expected behavior

Black formatter should format 3.10 related syntax/keywords too.

Environment (please complete the following information):

• Version: Big Sur 11.2.3
• OS and Python version: Mac OS and python3.10

Does this bug also happen on main? Yes

[JelleZijlstra]

Duplicate of #2242.