Update dependency livekit-client to v2.18.9 - autoclosed #1308

Job	Run time
Generating protobuf	22s
Make RTC sdist	12s
Build RTC wheels (x86_64)	42s
Build RTC wheels (aarch64)	1m 12s
Build RTC wheels (AMD64)	1m 20s
Build RTC wheels (x86_64 arm64)	1m 5s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	30s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	37s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	35s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	33s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	25s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	26s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	51s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 44s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 4s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	40s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	36s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 9s
Publish RTC release	0s
docs	-1s
	14m 2s

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