update `_scipy_fft.py` (#145) #322

Job	Run time
build_linux (3.9)	2m 34s
build_windows (3.9)	15m 14s
build_linux (3.10)	2m 48s
build_windows (3.10)	20m 38s
build_linux (3.11)	2m 37s
build_windows (3.11)	24m 34s
build_linux (3.12)	2m 37s
build_windows (3.12)	20m 39s
test_linux (3.9, false, ubuntu-latest)	1m 45s
test_linux (3.10, false, ubuntu-latest)	2m 17s
test_linux (3.11, false, ubuntu-latest)	1m 28s
test_linux (3.12, false, ubuntu-latest)	1m 10s
test_windows (3.9, false, windows-2019)	5m 22s
test_windows (3.10, false, windows-2019)	3m 41s
test_windows (3.11, false, windows-2019)	4m 14s
test_windows (3.12, false, windows-2019)	4m 0s
	1h 55m 38s

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