bump FFI to v0.12.67 #1581

Job	Run time
Generating protobuf	17s
Make RTC sdist	13s
Build RTC wheels (x86_64)	1m 1s
Build RTC wheels (AMD64)	1m 41s
Build RTC wheels (x86_64 arm64)	1m 6s
Build RTC wheels (aarch64)	1m 17s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	2m 8s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 9s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 17s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 56s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	3m 10s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 44s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 29s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 26s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 26s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 28s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 40s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 28s
Publish RTC release	-1s
docs	-1s
	28m 54s

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