Update dependency livekit-client to v2.20.0 #1646

Job	Run time
Make RTC sdist	18s
Generating protobuf	18s
Build RTC wheels (aarch64)	1m 25s
Build RTC wheels (x86_64)	51s
Build RTC wheels (x86_64 arm64)	1m 0s
Build RTC wheels (AMD64)	1m 15s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 49s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 30s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 7s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 58s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 29s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 28s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 37s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 26s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 39s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 43s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 3s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 0s
Publish RTC release	0s
docs	0s
	27m 56s

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