Update dependency livekit-client to v2.19.0 #1489

Job	Run time
Make RTC sdist	13s
Build RTC wheels (x86_64 arm64)	1m 5s
Generating protobuf	23s
Build RTC wheels (x86_64)	56s
Build RTC wheels (AMD64)	1m 19s
Build RTC wheels (aarch64)	1m 13s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 47s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	1m 54s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 2s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 32s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 41s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	3m 17s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 20s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 23s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 20s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 10s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 33s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 51s
Publish RTC release	0s
docs	0s
	27m 59s

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