fix: pinned version are not working once periodic / manual updates kick-in

[mayeut]

This extends the periodic_update function to take & respect the of_version argument as computed by from_bundle function (exact version or None).
Without this, the function would always return the most recent wheel found during a periodic/manual update without any regards to the exact version the user asked for.

Fixes #2203

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• ran the linter to address style issues (tox -e fix_lint)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[mayeut]

@pypa/virtualenv-committers,

do you have any recommendations / feedback on the inline comments before I take this a bit further ?
what direction would you want this to go ?

[mayeut]

Comments have been addressed.

[gaborbernat]

This now has been released under https://pypi.org/project/virtualenv/20.11.2/, thanks for your contribution!