We are less than 1 year until projects such as pandas and numpy drop support for Python 3.9 on April 5, 2024. See: https://numpy.org/neps/nep-0029-deprecation_policy.html#support-table

I'd love to make sure we support Python 3.10+ in time that packages in that ecosystem can continue to use docfx for documentation generation.