Latest bumpver issues on Python 3.12

[danielhollas]

I had huge issues with bumpver when trying to bump a version from v2.2.0a2 to v2.2.0,

bumpver update -t final

it would complain that the alpha version is higher than the new version.
In the end I needed to downgrade to version 2022.1120.

I suspect the problem is that I am running Python 3.12, where they have been some breaking changes to pkg_resources. I tracked down that the offending issue/ commit in bumpver is:

mbarkhau/bumpver#200
mbarkhau/bumpver@8dc594c

This is really an issue to be opened on bumpver, but I need some extra time to investigate.