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CI: Use miniforge because conda no longer included on GitHub runner images #1496

Job	Run time
Py3.12; no Slycot; no Pandas; conda CVXOPT	4m 9s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	4m 33s
Py3.12; no Slycot; no Pandas; no CVXOPT	5m 57s
Py3.10; no Slycot; no Pandas; no CVXOPT	5m 31s
Py3.12; conda Slycot; no Pandas; no CVXOPT	6m 22s
Py3.10; conda Slycot; no Pandas; no CVXOPT	4m 54s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	4m 48s
Py3.10; no Slycot; no Pandas; conda CVXOPT	6m 15s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	5m 13s
Finalize parallel coveralls	5s
	47m 47s