Update dependency livekit-client to v2.18.9 #1455

Job	Run time
Build RTC wheels (x86_64)	1m 15s
Build RTC wheels (x86_64 arm64)	54s
Build RTC wheels (aarch64)	1m 13s
Make RTC sdist	14s
Build RTC wheels (AMD64)	1m 39s
Generating protobuf	25s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	48s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 2s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	54s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 51s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 30s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	51s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 44s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 10s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 2s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 14s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 10s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	1m 3s
Publish RTC release	0s
docs	0s
	19m 59s

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