[3.11] Docs: Avoid a DeprecationWarning in `pyspecific.py` when running with Sphinx >=6.1 (GH-105886) (#106011)

Docs: Avoid a DeprecationWarning in `pyspecific.py` when running with Sphinx >=6.1 (GH-105886)
(cherry picked from commit a72683ba8e0337650cc490dbe593a5e46aba60cb)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>