Fix unpublish_track deadlock on FFI error #1632

Job	Run time
Generating protobuf	34s
Make RTC sdist	17s
Build RTC wheels (x86_64 arm64)	1m 32s
Build RTC wheels (x86_64)	49s
Build RTC wheels (AMD64)	1m 25s
Build RTC wheels (aarch64)	1m 22s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	18s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	51s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	37s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	19s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	36s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	29s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	35s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	47s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	51s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	19s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 28s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	27s
Publish RTC release	0s
docs	0s
	13m 36s

Provide feedback