Tests

Make test_abstract_blocktype work with MatrixAlgebraKit 0.6.6 (#262) #756

Job	Run time
Tests (lts, windows-latest) / Julia lts - windows-latest	13m 54s
Tests (lts, macOS-latest) / Julia lts - macOS-latest	6m 35s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	11m 53s
Tests (1, windows-latest) / Julia 1 - windows-latest	19m 40s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	13m 25s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	17m 40s
Tests	2s
	1h 23m 9s

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