Import deprecated scipy.linalg.triu from numpy.triu instead #952

Job	Run time
linters / linters	12s
Build ubuntu-20.04	42m 39s
Build windows-2019	50s
Build macos-11	33m 33s
Upload to S3	1m 5s
Test ${{ matrix.os }} Py${{ matrix.python }}	0s
	1h 18m 19s

Provide feedback