Update to python 3.12 #855

Job	Run time
Run linting/pre-commit checks	34s
check_docs	18s
unit_tests (macos-latest, 3.11)	9s
unit_tests (ubuntu-latest, 3.11)	6s
launch-slurm-actions-runner	0s
Run integration tests on the ${{ matrix.cluster }} cluster in job ${{ needs.launch-slurm-actions-runner.outputs.job_id }}	-1s
Upload coverage reports to Codecov	-1s
	1m 5s

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