automation: refresh requirements I'm hitting errors installing the old version of cffi due to an apparent issue where older versions of cffi aren't compatible with the modern Clang I'm using. So let's upgrade packages to unbreak things and to keep things modern. Differential Revision: https://phab.mercurial-scm.org/D12629

edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true