[FEAT]: Update python-semantic-release usage (including templates) to take advantage of enhancements added in python-semantic-release==9.10.0 #141
Description
Description
python-semantic-release version 9.10.0 added a lot of new features to make changelog updates simpler. This should allow simplifying the actions/workflows in this repository to no longer need to copy over the previous changelog file contents.
Additional Information
See the information on the https://python-semantic-release.readthedocs.io/en/stable/concepts/changelog_templates.html page about customizing the changelog and the available variables/filters for the template.
This change would probably necessitate a v2 release, since it would break backwards compatibility in the find_unreleased_changelog_items action.