update os-blast-test-matrix.yml to load slycot from conda-forge for w… #1070

Job	Run time
Py3.10; no Slycot; no Pandas; no CVXOPT	6m 42s
Py3.10; conda Slycot; no Pandas; no CVXOPT	6m 58s
Py3.10; no Slycot; no Pandas; conda CVXOPT	6m 46s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	7m 13s
Py3.12; no Slycot; no Pandas; no CVXOPT	6m 27s
Py3.12; no Slycot; no Pandas; conda CVXOPT	6m 45s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	7m 19s
Py3.12; conda Slycot; no Pandas; no CVXOPT	7m 11s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	7m 12s
Finalize parallel coveralls	3s
	1h 2m 36s

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