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CI: Use miniforge because conda no longer included on GitHub runner images #1495

Job	Run time
Py3.10; no Slycot; no Pandas; conda CVXOPT	7m 5s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	6m 37s
Py3.12; no Slycot; no Pandas; no CVXOPT	5m 59s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	6m 30s
Py3.12; no Slycot; no Pandas; conda CVXOPT	5m 37s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	7m 22s
Py3.10; conda Slycot; no Pandas; no CVXOPT	6m 33s
Py3.10; no Slycot; no Pandas; no CVXOPT	7m 10s
Py3.12; conda Slycot; no Pandas; no CVXOPT	6m 38s
Finalize parallel coveralls	5s
	59m 36s