[Bug 257770] textproc/py-sphinx: Add upstream patch to fix runtime error with Python 3.10

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 19 Sep 2021 19:11:23 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257770

--- Comment #3 from Danilo G. Baio <dbaio@freebsd.org> ---
Sorry about the delay.

I've started some build tests on ports that rely on Sphinx (a mini exp-run).

If it's all fine, I'll push this in a day or two.

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