Bump mamba-org/setup-micromamba from 1 to 2 #1260

# to view logs

Job	Run time
cache / contexts / retrieve latest CRDS contexts	10s
cache / download and cache CRDS test files	5s
ubuntu-latest Python 3.10	28m 12s
ubuntu-latest Python 3.11	31m 44s
ubuntu-latest Python 3.12	32m 20s
macos-latest Python 3.10	27m 41s
macos-latest Python 3.11	28m 6s
macos-latest Python 3.12	29m 36s
	2h 57m 54s

Provide feedback