CI: Move to `setup-micromamba` #369

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Run time

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Job	Run time
Check docs build	1m 18s
Test (3.8, false)	2m 42s
Test (3.10, false)	2m 55s
Test (3.6, true)	3m 41s
Test (3.10, true)	2m 57s
	13m 33s