tests

Add missing stubs for AudioFrame #1227

Job	Run time
py-3.9 lib-6.1 ubuntu-latest	5m 29s
py-3.9 lib-6.1 windows-latest	3m 12s
py-3.9 lib-6.0 ubuntu-latest	4m 13s
package-source	20s
py-3.9 lib-6.0 windows-latest	3m 9s
style	15s
py-3.9 lib-5.1 ubuntu-latest	4m 10s
py-3.9 lib-5.1 windows-latest	3m 7s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 25s
py-3.9 lib-6.1 macos-latest	6m 14s
package-wheel (macos-latest, arm64)	11m 36s
package-wheel (macos-latest, x86_64)	21m 4s
package-wheel (ubuntu-latest, aarch64)	2h 44m 15s
package-wheel (ubuntu-latest, i686)	17m 3s
package-wheel (ubuntu-latest, x86_64)	16m 28s
package-wheel (windows-latest, AMD64)	13m 25s
publish	42s
	4h 39m 7s

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