Fix dtype of dets in H2MM_C.pyx #114

Job	Run time
Build wheels on ubuntu-24.04-arm	1m 59s
Build wheels on windows-11-arm	1m 49s
Build wheels on macOS-14	2m 1s
Build wheels on ubuntu-latest	1m 44s
Build wheels on windows-latest	1m 52s
Build wheels on macOS-13	1m 51s
	11m 16s

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