textproc/py-sphinxcontrib-autoprogram: Update to 0.1.8

No functional changes.
Project is Python 3.7+ and now testing on 3.10 and 3.11

Changelog: https://github.com/sphinx-contrib/autoprogram/compare/0.1.7...0.1.8

PR: 269692
Approved by: flo (mentor)
Differential Revision: https://reviews.freebsd.org/D38729