Compatibility with MultiTensorKit #593

Job	Run time
Julia 1 - macOS-latest -	28m 25s
Julia lts - ubuntu-latest -	1h 13m 17s
Julia 1 - ubuntu-latest -	1h 21m 22s
Julia lts - macOS-latest -	21m 47s
Julia 1 - windows-latest -	1h 30m 28s
Julia lts - windows-latest -	1h 17m 16s
Julia nightly - ubuntu-latest -	50m 28s
Julia nightly - macOS-latest -	31m 38s
Julia nightly - windows-latest -	47m 28s
	8h 22m 9s

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