Update dependency livekit-client to v2.18.9 - autoclosed #1366

Job	Run time
Build RTC wheels (x86_64)	52s
Build RTC wheels (AMD64)	1m 9s
Make RTC sdist	15s
Generating protobuf	15s
Build RTC wheels (aarch64)	1m 17s
Build RTC wheels (x86_64 arm64)	48s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	30s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	31s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	47s
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)	48s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	56s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	55s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	29s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 37s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	35s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 6s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	45s
docs	-1s
Publish RTC release	-1s
	13m 58s

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