test

Add IGRF forward calculation #1490

Job	Run time
ubuntu-latest python=3.9 dependencies=oldest	31m 14s
ubuntu-latest python=3.12 dependencies=optional	31m 0s
windows-latest python=3.9 dependencies=oldest	22m 41s
macos-latest python=3.12 dependencies=latest	25m 54s
windows-latest python=3.12 dependencies=latest	22m 5s
ubuntu-latest python=3.12 dependencies=latest	22m 32s
macos-latest python=3.12 dependencies=optional	25m 28s
windows-latest python=3.12 dependencies=optional	25m 37s
macos-13 python=3.9 dependencies=oldest	32m 24s
codecov-upload	0s
	3h 58m 55s

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