Update dependency livekit-client to v2.18.9 - autoclosed #1378

Job	Run time
Make RTC sdist	18s
Build RTC wheels (x86_64)	47s
Build RTC wheels (x86_64 arm64)	1m 10s
Build RTC wheels (aarch64)	1m 32s
Build RTC wheels (AMD64)	1m 10s
Generating protobuf	16s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	29s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	25s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	44s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	29s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	37s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	57s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	26s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	31s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 33s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 19s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 7s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	42s
Publish RTC release	-1s
docs	-1s
	14m 30s

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