completely removed dtype in Spin class #1493

Job	Run time
runnable	0s
lint / lint	23s
test (3.9, true, true, ubuntu-latest)	8m 3s
test (3.9, true, true, macos-13)	13m 10s
test (3.9, true, false, ubuntu-latest)	7m 48s
test (3.9, true, false, macos-13)	16m 38s
test (3.9, true, false, macos-latest)	6m 37s
test (3.9, false, false, ubuntu-latest)	6m 57s
test (3.9, false, false, macos-13)	15m 26s
test (3.9, false, false, macos-latest)	4m 45s
test (3.13, true, false, ubuntu-latest)	11m 13s
test (3.13, true, false, macos-13)	24m 42s
test (3.13, true, false, macos-latest)	7m 12s
	2h 2m 54s

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