www/py-dj50-django-tables2: Update to 2.7.5

• Switch to the PEP517 build framework.

Changelog since 2.7.0:

https://github.com/jieter/django-tables2/blob/v2.7.5/CHANGELOG.md

MFH: 2025Q1
(cherry picked from commit 5a8d4731c6faddfee8ee05c38da77b60eaeb8caa)