Bump mamba-org/setup-micromamba from 2.0.3 to 2.0.4 (#434) #406

Job	Run time
linux_64_python3.9_default.____cpython	3m 30s
linux_64_python3.13_default.____cpython	3m 46s
linux_aarch64_python3.10_default.____cpython	3m 58s
linux_ppc64le_python3.10_default.____cpython	4m 4s
osx_64_python3.11_default.____cpython	4m 29s
osx_arm64_python3.9.____cpython	3m 33s
osx_arm64_python3.13.____cpython	3m 57s
win_64_python3.9.____cpython	13m 7s
win_64_python3.13.____cpython	12m 25s
	52m 49s

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