Expand all our workflows to run on Python version 3.12 Issue #579 #629

Job	Run time
Run unit test on cornflow-client (3.9, ubuntu-latest)	28s
Run unit test on cornflow-client (3.9, macOS-latest)	35s
Run unit test on cornflow-client (3.9, windows-latest)	1m 16s
Run unit test on cornflow-client (3.10, ubuntu-latest)	24s
Run unit test on cornflow-client (3.10, macOS-latest)	35s
Run unit test on cornflow-client (3.10, windows-latest)	1m 17s
Run unit test on cornflow-client (3.11, ubuntu-latest)	22s
Run unit test on cornflow-client (3.11, macOS-latest)	22s
Run unit test on cornflow-client (3.11, windows-latest)	1m 19s
Run unit test on cornflow-client (3.12, ubuntu-latest)	28s
Run unit test on cornflow-client (3.12, macOS-latest)	22s
Run unit test on cornflow-client (3.12, windows-latest)	1m 19s
Run all test suites on cornflow-client (3.9, ubuntu-latest)	37s
Run all test suites on cornflow-client (3.10, ubuntu-latest)	39s
Run all test suites on cornflow-client (3.11, ubuntu-latest)	36s
Run all test suites on cornflow-client (3.12, ubuntu-latest)	25s
	11m 4s

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