Use '_cffi_float_complex_t' or '_cffi_double_complex_t' more systematically #219

Job	Run time
make_windows_matrix	5s
make_linux_matrix	1s
make_macos_matrix	3s
python_sdist	11s
linux (cp313-manylinux_x86_64)	4m 46s
windows (cp313-win_amd64)	1m 44s
macos (cp313-macosx_x86_64, macos-13)	7m 30s
linux (cp313-musllinux_x86_64)	4m 40s
macos (cp313-macosx_arm64, 11.0, arch -arm64 bash --noprofile --norc -eo pipefail {0})	3m 25s
merge_artifacts	0s
check	4s
	22m 29s

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