Include`pytest-plone` mapping to

[ericof]

Add the following mapping to the [tool.dependencychecker] section in pyproject.toml if the user selects pytest

pytest-plone = ['pytest', 'zope.pytestlayer', 'plone.testing', 'plone.app.testing']

[gforcada]

Seems nobody worked on it 🫣

Do we want that to be conditional (optimal), or can we just go with it? That makes it so much easier, as it is adding a single line on pyproject.toml and that would be it ✨