Please branch and build python-httpx in epel9. If you do not wish to maintain python-httpx in epel9, or do not think you will be able to do this in a timely manner, I would be happy to be a co-maintainer of the package (FAS carlwgeorge).
*** Bug 2126969 has been marked as a duplicate of this bug. ***
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-213831e139