chore: update rust-sdks to livekit-ffi v0.12.68 #1596

Job	Run time
Make RTC sdist	11s
Build RTC wheels (x86_64 arm64)	56s
Generating protobuf	33s
Build RTC wheels (aarch64)	1m 8s
Build RTC wheels (AMD64)	1m 18s
Build RTC wheels (x86_64)	48s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 34s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 54s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 35s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 6s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 35s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 53s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 55s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 41s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 38s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 2s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 2s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 31s
Publish RTC release	0s
docs	0s
	28m 20s

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