Drop Python 3.7/3.8/3.9 support and add 3.13 support#471

BrianJKoopman wants to merge 5 commits intov0.13.0-devsimonsobs/ocs:v0.13.0-devfrom

koopman/python-version-supportsimonsobs/ocs:koopman/python-version-supportCopy head branch name to clipboard