update os-blast-test-matrix.yml to load slycot from conda-forge for w… #1068

Job	Run time
Py3.10; no Slycot; no Pandas; no CVXOPT	4m 11s
Py3.10; no Slycot; no Pandas; conda CVXOPT	4m 10s
Py3.10; conda Slycot; no Pandas; no CVXOPT	4m 11s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	4m 11s
Py3.12; conda Slycot; no Pandas; no CVXOPT	4m 0s
Py3.12; no Slycot; no Pandas; no CVXOPT	4m 11s
Py3.12; no Slycot; no Pandas; conda CVXOPT	4m 0s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	4m 0s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	4m 0s
Finalize parallel coveralls	3s
	36m 57s

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