tests

Allow using pathlib.Path for av.open #966

Job	Run time
style	16s
package-wheel (macos-latest, arm64)	24m 22s
package-source	27s
py-3.8 lib-6.0 ubuntu-latest	5m 7s
package-wheel (macos-latest, x86_64)	27m 52s
py-3.8 lib-5.1 ubuntu-latest	4m 7s
package-wheel (ubuntu-latest, aarch64)	3h 19m 51s
py-3.8 lib-5.0 ubuntu-latest	4m 7s
package-wheel (ubuntu-latest, i686)	21m 36s
py-3.8 lib-6.0 windows-latest	4m 37s
py-pypy3.9 lib-5.0 ubuntu-latest	4m 28s
package-wheel (ubuntu-latest, x86_64)	20m 52s
py-3.8 lib-5.1 windows-latest	3m 37s
py-3.8 lib-5.0 macos-latest	6m 29s
package-wheel (windows-latest, AMD64)	16m 6s
py-3.8 lib-5.0 windows-latest	4m 12s
publish	40s
	5h 48m 46s

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