dev-python/pydub-0.25.1 fails tests: AttributeError: AudioSegmentTests object has no attribute assertEquals

[asarubbo]

https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: dev-python/pydub-0.25.1 fails tests.
Discovered on: amd64 (internal ref: pentoo_tinderbox)
System: GCC-14-SYSTEM (https://wiki.gentoo.org/wiki/Project:Tinderbox/Common_Issues_Helper#GCC-14)

Info about the issue:
https://wiki.gentoo.org/wiki/Project:Tinderbox/Common_Issues_Helper#CF0015

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build log: https://gist.github.com/asarubbo/444153aeb403861aa4c87d4533e3b355
Context of error(s): https://gist.github.com/asarubbo/6899e62e41672a29f580a4a6fca21b0b