community/py3-magic: fix tests with libmagic 5.45
Fixes error found during 3.19 rebuild: https://build.alpinelinux.org/buildlogs/build-3-19-ppc64le/community/py3-magic/py3-magic-0.4.27-r2.log
Fixes error found during 3.19 rebuild: https://build.alpinelinux.org/buildlogs/build-3-19-ppc64le/community/py3-magic/py3-magic-0.4.27-r2.log