Revert update on ansi2html, atpublic, pygments

py3-ansi2html and py3-atpublic updates will only build on Alpine 3.16
which isn't yet the targetted version.

py3-pygments still needs to be held back for strange makedependency
incompatibility. Unsure if this will be solved by bumping Alpine
version.

Also, the dropping of py3-pgpy was greatly exaggerated. py3-srht still
depends on it. Maybe it will be dropped in a future update, hard to say.

Batch of updates

dropped
=======
py3-pgpy (?)
py3-sshpubkeys
py3-anyjson

bumped
======
builds.sr.ht
git.sr.ht
lists.sr.ht (*)
meta.sr.ht
todo.sr.ht
py3-ansi2html
py3-asyncpg (*)
py3-atpublic
py3-furl
py3-humanize
py3-minio
py3-mistletoe
py3-pgpy (?)
py3-pygments
py3-sqlalchemy-utils
py3-srht (!)

downgraded
==========
py3-billiard

re-built/re-released
====================
py3-vine

*=I don't actually build this package currently, I'm just tracking
development.

?=Re-added, but not as a dependency to anything I build. Starting now,
this package will be categorized with the *'ed packages.

!=Upstream project also re-released as r1. Starting now, I will not
blindly follow upstream's release number.

Reshaping repo

The repo is designed for use with an existing builds.sr.ht service.
Besides lacking that, I am more interested in a containerized workflow
powered by a Makefile. Package source code will live in `pkgsrc/`,
packages will be built into `pkg/`, and packaging keys will be
generated into `keys/`.

Alos trimmed the packages down to what I will build.