Switch to mdi conda-forge package in CI #1393

Job	Run time
windows (windows-latest)	2m 37s
posix (ubuntu-latest, OFF)	10m 57s
posix (ubuntu-latest, ON)	13m 33s
conda (ubuntu-latest)	1m 40s
posix (ubuntu-latest, mpich, OFF)	42m 54s
posix (ubuntu-latest, mpich, ON)	49m 11s
posix (ubuntu-latest, openmpi, OFF)	39m 26s
posix (ubuntu-latest, openmpi, ON)	47m 23s
posix (macos-latest, OFF)	1m 2s
posix (macos-latest, ON)	1m 21s
posix (macos-latest, mpich, OFF)	2m 29s
posix (macos-latest, mpich, ON)	2m 23s
	3h 34m 56s

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