view .arcconfig @ 45642:56281b75264a

contrib: install latest versions of Python

Let's keep our build environment modern.

We upgrade 3.5-3.8 on Linux. Just 3.7 and 3.8 on Windows because we
don't use <3.7 on Windows.

Differential Revision: https://phab.mercurial-scm.org/D9145

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