Add Python 3.13 testing enviromments
Python 3.13 is in release candidate phase and the conda-forge migration is proceeding. We should provide an igwn-py313-testing environment as soon as we are able.
Edited by Duncan Macleod
Python 3.13 is in release candidate phase and the conda-forge migration is proceeding. We should provide an igwn-py313-testing environment as soon as we are able.