The Cbc optimizer does not support Apple Silicon thus tests fail. Switch to HiGHS for tests. #21

Job	Run time
Documentation	2m 16s
Julia 1 - macos-latest - x64 - pull_request	6m 10s
Julia 1 - windows-latest - x64 - pull_request	3m 25s
Julia 1 - ubuntu-latest - x64 - pull_request	4m 11s
Julia 1 - macos-latest - aarch64 - pull_request	2m 54s
Julia 1.10 - windows-latest - x64 - pull_request	2m 19s
Julia 1.10 - macos-latest - x64 - pull_request	4m 30s
Julia 1.10 - ubuntu-latest - x64 - pull_request	2m 5s
	27m 50s

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