fix(deps): update dependency livekit-client to v2.15.6

This MR contains the following updates:

Package	Change	Age	Confidence
livekit-client	=2.15.5 -> =2.15.6

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Release Notes

livekit/client-sdk-js (livekit-client)

v2.15.6

Compare Source

Patch Changes

• Query audio track with all constraints present - #​1624 (@​lukasIO)

• Ensure RemoteVideoTracks without any attached elements are stopped by adaptiveStream - #​1625 (@​lukasIO)

• Disable av1 for firefox - #​1631 (@​cnderrauber)

• Use SIF payload hashes to ensure integrity - #​1629 (@​lukasIO)

• fix(e2ee): h264 publishing with e2ee enabled - #​1632 (@​lukasIO)

• Check for encrypted track if room unencrypted, and if so, emit an event - #​1627 (@​1egoman)

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