psutil was previously vendored manually, so re-vendor it using our new tooling
to make for smaller diffs in follow-up patches. This mostly just winds up
adding some extra files that must have been left out of the manual vendoring,
but it also updates the third_party/python/requirements.{in,txt}.
Differential Revision: https://phabricator.services.mozilla.com/D3434
--HG--
extra : moz-landing-system : lando