Update dependency livekit-client to v2.18.9 - autoclosed #1388

Job	Run time
Generating protobuf	16s
Make RTC sdist	17s
Build RTC wheels (x86_64)	52s
Build RTC wheels (AMD64)	1m 11s
Build RTC wheels (aarch64)	1m 24s
Build RTC wheels (x86_64 arm64)	1m 1s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	50s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	53s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	35s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 42s
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)	2m 6s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	43s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 14s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	37s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	44s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	39s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	31s
Publish RTC release	0s
docs	0s
	16m 13s

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