Python 2.11 with pip 23.2.1 refuses to install txpostgres

[donalm]

I'm a bit unclear on the details but python-3.11 with pip-23.2.1 on CentOS7 is refusing to install txpostgres for me:

pip install  txpostgres
ERROR: Could not find a version that satisfies the requirement txpostgres (from versions: none)
ERROR: No matching distribution found for txpostgres

Maybe related to:
pypa/pip#8559

It installs correctly with python-3.9 and pip-23.2.1 on the same machine.