Update dependency livekit-client to v2.18.9 - autoclosed #1436

Job	Run time
Generating protobuf	25s
Make RTC sdist	14s
Build RTC wheels (AMD64)	1m 58s
Build RTC wheels (x86_64)	50s
Build RTC wheels (aarch64)	1m 18s
Build RTC wheels (x86_64 arm64)	1m 12s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	30s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 11s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 6s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 31s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	36s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	34s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	32s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	48s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	28s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	32s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	50s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	50s
Publish RTC release	0s
docs	0s
	15m 25s

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