Remove use of deprecated Mambaforge #23

Job	Run time
build (3.9)	1m 54s
build_windows (3.9)	20m 45s
build (3.10)	1m 51s
build_windows (3.10)	14m 24s
build (3.11)	1m 53s
build (3.12)	1m 58s
build_windows (3.11)	20m 42s
build_windows (3.12)	20m 41s
test (3.9, numpy"<2", false, ubuntu-latest)	52s
test (3.9, numpy">=2", false, ubuntu-latest)	47s
test (3.10, numpy"<2", false, ubuntu-latest)	1m 4s
test (3.10, numpy">=2", false, ubuntu-latest)	40s
test (3.11, numpy"<2", false, ubuntu-latest)	52s
test (3.11, numpy">=2", false, ubuntu-latest)	49s
test (3.12, numpy"<2", false, ubuntu-latest)	49s
test (3.12, numpy">=2", false, ubuntu-latest)	59s
test_windows (3.9, numpy"<2", false, windows-2019)	3m 8s
test_windows (3.9, numpy">=2", false, windows-2019)	3m 7s
test_windows (3.10, numpy"<2", false, windows-2019)	3m 17s
test_windows (3.10, numpy">=2", false, windows-2019)	3m 8s
test_windows (3.11, numpy"<2", false, windows-2019)	3m 17s
test_windows (3.11, numpy">=2", false, windows-2019)	3m 32s
test_windows (3.12, numpy"<2", false, windows-2019)	2m 55s
test_windows (3.12, numpy">=2", false, windows-2019)	3m 22s
	1h 56m 46s

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