devel/py-virtualenv: Update to 21.11.0
- Enable tests. To this end, do not load automatically plugins that are not compatible with the current version of pytest, such as devel/py-pytest-black and textproc/py-pytest-markdown, if they are installed on the system.
- Update list of test dependencies
ChangeLog:
- https://github.com/pypa/virtualenv/releases/tag/21.9.1
- https://github.com/pypa/virtualenv/releases/tag/21.10.0
- https://github.com/pypa/virtualenv/releases/tag/21.11.0
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