Update RTD OS to recommended version #155

Job	Run time
Python 3.10 on macOS	21m 13s
Python 3.10 on Linux	13m 13s
Python 3.12 on Linux	13m 22s
Python 3.12 on macOS	29m 13s
Create release and send to PyPI	0s
	1h 17m 1s

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