Update dependency livekit-client to v2.18.9 - autoclosed #1374

Job	Run time
Generating protobuf	17s
Make RTC sdist	24s
Build RTC wheels (x86_64)	56s
Build RTC wheels (x86_64 arm64)	50s
Build RTC wheels (aarch64)	1m 28s
Build RTC wheels (AMD64)	1m 43s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 4s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	29s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	27s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	43s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	39s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	28s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	38s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 58s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	29s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 8s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 8s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	40s
Publish RTC release	0s
docs	0s
	16m 29s

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