Update Mambaforge to Miniforge3 in test GHA #399

Job	Run time
build ubuntu-latest (x86_64) wheels	2m 10s
Build sdist	10s
build macos-latest (x86_64) wheels	2m 47s
build macos-latest (arm64) wheels	1m 31s
build windows-latest (AMD64) wheels	4m 1s
Show artifacts	4s
Publish to Test PyPI	0s
Publish to PyPI	0s
	10m 43s

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