Update dependency livekit-client to v2.18.9 - autoclosed #1398

Job	Run time
Generating protobuf	18s
Make RTC sdist	18s
Build RTC wheels (AMD64)	1m 16s
Build RTC wheels (x86_64 arm64)	57s
Build RTC wheels (x86_64)	47s
Build RTC wheels (aarch64)	1m 16s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 0s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	38s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 8s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 11s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	28s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	28s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 0s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	37s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	39s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	34s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	28s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	40s
Publish RTC release	0s
docs	-1s
	14m 42s

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