fix: revert livekit-client version to fix self-mute error

Maximilian Fußrequested to merge
m.fuss/web-app:2456-revert-livekit-client-update-to-v2-9-6 into main

the bug only appears on firefox (can be tested on https://testing.opentalk.eu)

Closes #2456

Edited by Maximilian Fuß

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