[Snyk] Security upgrade zipp from 3.15.0 to 3.19.1

[funilrys]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements.docs.txt

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• Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

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[coveralls]

coverage: 94.723%. remained the same
when pulling fd2eed4 on snyk-fix-c5b593325ea0afcad67099468612543c
into 8e73f7c on dev.