Use experimental complex extension for all complex arithmetic #5549

Job	Run time
build_linux (3.9)	37m 45s
build_windows (3.9)	56m 15s
build_linux (3.10)	38m 22s
build_windows (3.10)	1h 9m 14s
build_linux (3.11)	38m 57s
build_windows (3.11)	1h 3m 51s
build_linux (3.12)	38m 39s
build_windows (3.12)	1h 5m 39s
build_linux (3.13)	37m 23s
build_windows (3.13)	1h 1m 11s
test_examples_linux (3.11, false, ubuntu-22.04)	6m 58s
test_linux (3.9, false, ubuntu-22.04)	12m 45s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 28s
test_linux (3.10, false, ubuntu-22.04)	12m 1s
test_linux (3.11, false, ubuntu-22.04)	12m 18s
test_linux (3.12, false, ubuntu-22.04)	11m 45s
test_linux (3.13, false, ubuntu-22.04)	12m 24s
upload_linux	0s
test_windows (3.9, false, windows-2019)	13m 24s
test_windows (3.10, false, windows-2019)	13m 16s
test_windows (3.11, false, windows-2019)	13m 0s
test_windows (3.12, false, windows-2019)	13m 2s
test_windows (3.13, false, windows-2019)	14m 6s
upload_windows	0s
Clean up anaconda packages	0s
	10h 47m 43s

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