py3-*: bump pkgrel and update upstream versions

Update all non-sr.ht Python packages

py3-asyncpg: upgrade to 0.23.0

py3-asyncpg: upgrade to 0.22.0

py3-asyncpg: upgrade to 0.21.0

py3-asyncpg: upgrade to 0.20.1

sr.ht/py3-asyncpg: update to 0.20.0

Normalize py-* packages