[all][tc] Thoughts on Python 3.7 support

Hello, There have been many patches submitted to drop the Python 3.7 classifier from setup.cfg: https://review.opendev.org/q/%2522remove+py37%2522 The justification is that Wallaby tested runtimes only include 3.6 and 3.8. Most projects are merging these patches, but I've seen a couple of objections from ironic and horizon: - https://review.opendev.org/c/openstack/python-ironicclient/+/769044 - https://review.opendev.org/c/openstack/horizon/+/769237 What are the thoughts of the TC and of the overall community on this? Should we really drop these classifiers when there are no corresponding CI jobs, even though more Python versions may well be supported? Best wishes, Pierre Riteau (priteau)