chore: update rust-sdks to livekit-ffi v0.12.68 #1590

Job	Run time
Make RTC sdist	17s
Build RTC wheels (x86_64 arm64)	50s
Build RTC wheels (AMD64)	1m 18s
Build RTC wheels (aarch64)	1m 19s
Build RTC wheels (x86_64)	46s
Generating protobuf	21s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 29s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 55s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 54s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 15s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 31s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 54s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	2m 18s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 57s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 29s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 31s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 29s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 25s
Publish RTC release	0s
docs	0s
	26m 58s

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