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