www/py-django-simple-captcha: Update to 0.6.3
- Switch to the PEP517 build framework and adjust relevant bits of the DOCS option as well.
Changelog since 0.5.20:
https://github.com/mbi/django-simple-captcha/blob/v0.6.3/CHANGES
PR: 291802
Approved by: maintainer timeout (4+ weeks)