Prepare v0.6 (#430) #517

Job	Run time
oorb-data / Download OpenOrb data for sbpy testing	8s
Python 3.11 with all optional dependencies (MacOS)	2m 51s
tests / Load tox environments	10s
tests / Python 3.13 with minimal dependencies, measuring coverage	53s
tests / Code style checks	27s
tests / Python 3.11 with all optional dependencies, measuring coverage	1m 58s
tests / Python 3.9 with oldest supported versions, measuring coverage	2m 5s
	8m 32s

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