textproc/py-sphinx-autoapi: Update to 1.8.0

Changelog: https://github.com/readthedocs/sphinx-autoapi/blob/v1.8.0/CHANGELOG.rst

Add setup.py build workaround because upstream switched to PEP-517
packaging.

PR: 255146
Submitted by: Andreas Bilke <andreas@bilke.org> (maintainer) - based on