Bump uniffi from 0.28.0 to 0.29.2 #151

Job	Run time
clippy	28s
apple_simulator_integration_tests (aarch64-apple-ios-sim, iOS)	5m 34s
integration_tests	1m 22s
typos	7s
uniffi-check	31s
apple_simulator_integration_tests (aarch64-apple-tvos-sim, tvOS, -Zbuild-std)	3m 36s
apple_simulator_integration_tests (aarch64-apple-watchos-sim, watchOS, -Zbuild-std)	3m 22s
android_simulator_integration_tests	5m 22s
fmt	9s
	20m 31s

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