Build+Upload MCX and Octave/MATLAB mex

[ci] revert to macos-12 as macos-13 does not have conda #423

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Run time

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Job	Run time
Build All (ubuntu-20.04)	5m 22s
Build All (macos-12)	7m 48s
Build All (windows-2019)	8m 2s
Upload Packages	0s
	21m 12s