Import deprecated scipy.linalg.triu from numpy.triu instead #949

Job	Run time
linters / linters	10s
Build ubuntu-20.04	43m 4s
Build windows-2019	46s
Build macos-11	33m 46s
Upload to S3	15s
Test ${{ matrix.os }} Py${{ matrix.python }}	0s
	1h 18m 1s

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