Add brackets and missing operators to Python grammar (#11180)

Release Notes:

- Fixed #4341 

Before:

![before](https://github.com/zed-industries/zed/assets/16101408/34672e47-5131-481a-803e-064db8126cc9)

After:

![after](https://github.com/zed-industries/zed/assets/16101408/7d2405c6-d04f-4738-ad2e-a9424b1c9d19)
2306e3cd50adorabilis committed on 5/3/2024, 9:37:44 AM· committed by GitHubparentf252d9c
1 file changedLine totals unavailable