Build+Upload MCX and Octave/MATLAB mex

[ci] downgrade download-artifact as it does not support multiple jobs #434

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Run time

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Job	Run time
Build All (ubuntu-20.04)	5m 56s
Build All (macos-12)	8m 48s
Build All (windows-2019)	10m 13s
Upload Packages	22s
	25m 19s