Tests

Optimise cumsum #2787

Job	Run time
Build and test on ubuntu-latest (numpy 1.26)	16m 59s
Build and test on ubuntu-latest (python 3.14)	14m 5s
Build and test on windows-latest (python 3.12)	24m 56s
Build and test on macos-latest (python 3.12)	14m 45s
Build and test on ubuntu-latest (python 3.12)	13m 17s
	1h 24m 2s

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