textproc/py-sphinx-autoapi: Update to 1.8.4

While here, pet portfmt and add concurrent.

Chages: https://github.com/readthedocs/sphinx-autoapi/blob/v1.8.4/CHANGELOG.rst
PR: 258884
Approved by: philip (mentor)
Differential Revision: https://reviews.freebsd.org/D33225