Update requirements.txt to resolve issue #2116

[ImGoingToBakeMyGPU]

Recent changes to av have removed support for "rb" and "rw" as arguments for av.open(). A working fix is to use an older version of av.

Pull request checklist

• [ #] The PR has a proper title. Use Semantic Commit Messages. (No more branch-name title please)
• [ #] Make sure this is ready to be merged into the relevant branch. Please don't create a PR and let it hang for a few days.
• [ #] Ensure you can run the codes you submitted successfully. These submissions will be prioritized for review:

PR type

• Bug fix for issue A bug in preprocess pipeline: ValueError: mode must be 'r', 'w', or None, got: rb #2116

Description

-av module will be forced to 9.2.0 in requirements.

Screenshot

• Please include a screenshot if applicable