[Bug 242463] devel/mercurial: Update to 5.2.2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242463

--- Comment #18 from Kubilay Kocak <koobs at FreeBSD.org> ---
>From the mercurial wiki [1]:

Mercurial 5.2 is the first release that officially has support for Python 3. 

Supported Python 3 versions are 3.5, 3.6, and 3.7. 

Python 3.8 mostly works, but there are a few known incompatibilities

It is the project policy for Mercurial and its core extensions to be compatible
with Python 3. Over 99% of tests pass with Python 3 and test regressions are
treated seriously. 

But also, from version 5.x overview [2]

If you package Mercurial or distribute it to users, we do not recommend making
Python 3 the default at this time.

We should probably make a mercurial python 3 port/package, or custom flavour
the mercurial port making Python 2.x the default, but allowing Python 3 builds.

[1] https://www.mercurial-scm.org/wiki/Python3
[2] https://www.mercurial-scm.org/wiki/Release5.0

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