Tests

Remove hardcoded Float64s in AkimaInterpolation #354

Job	Run time
Tests (1, macos-latest) / Tests	10m 0s
Tests (1, ubuntu-latest) / Tests	12m 19s
Tests (1, windows-latest) / Tests	14m 53s
Tests (lts, macos-latest) / Tests	6m 47s
Tests (lts, ubuntu-latest) / Tests	10m 28s
Tests (lts, windows-latest) / Tests	11m 51s
Tests (pre, macos-latest) / Tests	9m 28s
Tests (pre, ubuntu-latest) / Tests	10m 11s
Tests (pre, windows-latest) / Tests	12m 44s
	1h 38m 41s

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