Bump mamba-org/setup-micromamba from 2.0.7 to 3.0.0 #12

Job	Run time
docs	23s
test_environments (macos-latest)	54s
test_environments (ubuntu-latest)	44s
test (ubuntu-latest, pypy-3.11)	8m 8s
test (macos-latest, 3.9)	3m 5s
test (macos-latest, 3.14)	3m 15s
test (ubuntu-latest, 3.9)	48s
test (macos-latest, pypy-3.11)	10m 32s
test (ubuntu-latest, 3.14)	47s
	28m 36s

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