databases/py-pony: Update 0.7.17 → 0.7.19

Replace PORTVERSION with DISTVERSION.

Changelogs:
PonyORM release 0.7.19 (2024-08-27)

Bugfixes
  Add missed Python 3.12 classifier

PonyORM release 0.7.18 (2024-08-26)

Features
  Add Python 3.12 support
Bugfixes
  Fix #704 JSON handling in SQLite >= 3.45

https://github.com/ponyorm/pony/releases/tag/v0.7.18
https://github.com/ponyorm/pony/releases/tag/v0.7.19

PR: 281287