Update dependency livekit-client to v2.18.9 - autoclosed #1413

Job	Run time
Make RTC sdist	20s
Generating protobuf	20s
Build RTC wheels (aarch64)	1m 22s
Build RTC wheels (x86_64 arm64)	49s
Build RTC wheels (AMD64)	1m 16s
Build RTC wheels (x86_64)	1m 19s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	45s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	34s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	28s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 18s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	37s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	32s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 47s
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 3.14) / Test (ubuntu-latest, Python 3.14)	38s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 31s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 19s
Publish RTC release	0s
docs	0s
	16m 17s

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