Revert vendoring of SciPy functions #693

Job	Run time
build_linux (3.10)	3m 17s
build_linux (3.9)	3m 17s
build_linux (3.13)	3m 7s
build_linux (3.12)	3m 2s
build_windows (3.12)	8m 35s
build_windows (3.11)	9m 34s
build_windows (3.10)	10m 36s
build_windows (3.9)	7m 51s
build_windows (3.13)	7m 38s
build_linux (3.11)	2m 50s
test_linux (3.12, false, ubuntu-latest)	1m 39s
test_linux (3.9, false, ubuntu-latest)	1m 35s
test_linux (3.11, false, ubuntu-latest)	1m 53s
test_linux (3.10, false, ubuntu-latest)	1m 48s
test_linux (3.13, false, ubuntu-latest)	2m 28s
test_windows (3.9, false, windows-latest)	3m 41s
test_windows (3.13, false, windows-latest)	4m 41s
test_windows (3.10, false, windows-latest)	3m 19s
test_windows (3.11, false, windows-latest)	3m 26s
test_windows (3.12, false, windows-latest)	2m 57s
	1h 27m 14s

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