textproc/py-pydata-sphinx-theme: Unbreak this port after a7a3ac5596fdb27fb974c7993002b63994fe001e

• Allow build with py-sphinx 5.x
• Bump PORTREVISION for package change

Reference: https://github.com/pydata/pydata-sphinx-theme/commit/b806673afbcc5e13a68d2a28b1dde92c8729cbd7
(cherry picked from commit 5447e2ed1663a31566e0ff311755cdc0bb47ba93)