Update dependency livekit-client to v2.18.9 #1466

Job	Run time
Build RTC wheels (x86_64)	50s
Build RTC wheels (x86_64 arm64)	50s
Generating protobuf	18s
Build RTC wheels (AMD64)	1m 45s
Make RTC sdist	19s
Build RTC wheels (aarch64)	1m 13s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 26s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	57s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	1m 22s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	54s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 57s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	55s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 13s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	50s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 52s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 4s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	52s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	59s
Publish RTC release	0s
docs	0s
	19m 36s

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