* Remove use of deprecated imp.load_source
The entire `imp` module has been removed from Python 3.12. This patch applies the recommended replacement using `importlib`.
* Fix usage of from importlib.metadata.entry_points to work with newer importlib & Python 3.12
* Update registry.py
Fix order of imports
* Use importlib.util.module_from_spec() instead of deprecated load_module()
* auto-fixed import style (isort)
* enable py 12
* run coverage for lower and upper bound
* fix style error
* make import conditional
* fix?
* fix env
* style fix
* only use new loader on 3.12
* fix order
* fix module loading
* reimplement assertDictContainsSubset
* remove old testing alias
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Co-authored-by: Thea Flowers <thea@winterbloom.com>
Co-authored-by: Oliver <oliver.henry.walters@gmail.com>
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