maintainer-feedback requested: [Bug 258352] devel/mercurial: Update to 5.9.1

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 07 Sep 2021 21:33:49 UTC
Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-python (Nobody)
<python@FreeBSD.org> for maintainer-feedback:
Bug 258352: devel/mercurial: Update to 5.9.1
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258352



--- Description ---
Mercurial 5.9 has been released on August 20; the current source release
available for download on the mercurial website is 5.9.1.

An overview of new features introduced with version 5.9 is available at
https://www.mercurial-scm.org/wiki/Release5.9

This patch updates the port to version 5.9.1.

Tested with poudriere testport using a 12.2-Release-p10 jail (amd64 and i386).