[python+docs]: Update sphinx requirement from ~=8.0 to ~=9.1 in /docs#78

jwodder merged 1 commit intomasterwheelodex/headerparser:masterfrom

dependabot/pip/docs/sphinx-approx-eq-9.1wheelodex/headerparser:dependabot/pip/docs/sphinx-approx-eq-9.1Copy head branch name to clipboard