Bump mamba-org/setup-micromamba from 1 to 2 #287

Job	Run time
mypy	3m 49s
py3.12 \| macos \| unit tests	9m 37s
py3.12 \| macos \| integration tests	16m 31s
py3.12 \| ubuntu \| unit tests	13m 30s
py3.12 \| ubuntu \| integration tests	17m 47s
py3.12 \| windows \| unit tests	21m 1s
py3.12 \| windows \| integration tests	30m 32s
py3.10 \| ubuntu \| unit tests	12m 26s
py3.11 \| ubuntu \| unit tests	12m 16s
merge-test-artifacts	2s
	2h 17m 31s

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