Update dependency livekit-client to v2.19.2 #1548

Job	Run time
Make RTC sdist	20s
Generating protobuf	18s
Build RTC wheels (x86_64 arm64)	1m 11s
Build RTC wheels (x86_64)	1m 1s
Build RTC wheels (AMD64)	1m 41s
Build RTC wheels (aarch64)	1m 13s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 48s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 32s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 55s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 35s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 57s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 40s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 0s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 28s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 32s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 49s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 29s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 28s
Publish RTC release	-1s
docs	-1s
	27m 55s

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