packaging: update the certifi dependency Not sure if this helps with recent certificate issues[1], but we might as well keep this modern. Note that certifi no longer claims py2 support, and there's a PR to add it back in[2]. Py2 support was dropped in 2020.04.05.2 (which predates what's being updated here). None of the *.py files have changed since the 2020.6.20 release, and I was able to call `certifi.where()` in both a virtualenv and with `hg debugshell` from an MSI install with this version, so we shouldn't be any worse off than before. [1] https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5745 [2] https://github.com/certifi/python-certifi/pull/154 Differential Revision: https://phab.mercurial-scm.org/D11609