bump version to 2.5.3

bump version to 2.5.2

bump version to 2.5.1

bump version to 2.5.0

bump version to 2.4.3

bump version to 2.4.2

bump version to 2.4.1

revert poetry version minor change -- with alpha version set, it's un…

…necessary

mess with more stuff to try to make powermon optional

Add a warning about this being the last version supporting python 3.8