Update dependency livekit-client to v2.20.0 #1627

Job	Run time
Build RTC wheels (aarch64)	1m 11s
Make RTC sdist	13s
Build RTC wheels (AMD64)	1m 19s
Build RTC wheels (x86_64)	47s
Build RTC wheels (x86_64 arm64)	58s
Generating protobuf	29s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 27s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 2s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 24s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 46s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 43s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 27s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 30s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 48s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 44s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 28s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	2m 8s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 41s
Publish RTC release	0s
docs	-1s
	28m 4s

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