dev-python/sentry-sdk-1.18.0 fails tests: ModuleNotFoundError: No module named mock

[asarubbo]

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

Issue: dev-python/sentry-sdk-1.18.0 fails tests.
Discovered on: amd64 (internal ref: ci)

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build log: https://gist.github.com/asarubbo/6cbe8e75d2882b9421521329667cf091
Context of error(s): https://gist.github.com/asarubbo/ab71a7d49b2f8503693a569d33a7c212