Remove pyav pin to allow python 3.11 to be used

[CalOmnie]

What does this PR do?

Remove the two year old pin on av==9.2.0, this pin was made due to issue with the audio stream in av==10.0.0, this seems to not be an issue anymore sinve av is not used to extract audio streams anywhere.

Fixes #35803

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@vanpelt

[Rocketknight1]

I suspect this pin was put in place and then forgotten about, because the latest version of av is now very far past 10.0. Thank you for fixing it, which in turn should make it a lot easier to use those models with modern Python!

[Rocketknight1]

(I think this should be fine, but I'll keep an eye on our nightly CI after this is merged, just in case we get any new issues as a result - cc @ydshieh)