Bump mamba-org/setup-micromamba from 1 to 2 #286

Job	Run time
mypy	4m 0s
py3.12 \| macos \| integration tests	12m 54s
py3.12 \| macos \| unit tests	9m 14s
py3.12 \| ubuntu \| integration tests	17m 48s
py3.12 \| ubuntu \| unit tests	13m 29s
py3.12 \| windows \| integration tests	31m 51s
py3.12 \| windows \| unit tests	20m 23s
py3.10 \| ubuntu \| unit tests	12m 27s
py3.11 \| ubuntu \| unit tests	12m 54s
merge-test-artifacts	8s
	2h 15m 8s

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