chore: update rust-sdks to livekit-ffi v0.12.68 #1598

Job	Run time
Build RTC wheels (AMD64)	1m 7s
Make RTC sdist	17s
Generating protobuf	24s
Build RTC wheels (x86_64 arm64)	1m 7s
Build RTC wheels (aarch64)	1m 8s
Build RTC wheels (x86_64)	55s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 26s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	2m 11s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 30s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 14s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	1m 54s
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 42s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 23s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 5s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 40s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 29s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 1s
Publish RTC release	0s
docs	-1s
	26m 58s

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