[MAINT] Unpin conda-build in Conda package workflow #5375

Job	Run time
build_linux (3.9)	35m 52s
build_linux (3.10)	36m 25s
build_linux (3.11)	37m 15s
build_windows (3.9)	1h 3m 53s
build_linux (3.12)	35m 36s
build_windows (3.10)	1h 3m 38s
build_linux (3.13)	40m 26s
build_windows (3.11)	1h 4m 17s
build_windows (3.12)	1h 15m 28s
build_windows (3.13)	1h 13m 52s
array-api-conformity (3.10, false, ubuntu-22.04)	4m 54s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 13s
test_linux (3.9, false, ubuntu-22.04)	10m 41s
test_linux (3.10, false, ubuntu-22.04)	10m 38s
test_linux (3.11, false, ubuntu-22.04)	10m 55s
test_linux (3.12, false, ubuntu-22.04)	10m 49s
test_linux (3.13, false, ubuntu-22.04)	10m 48s
upload_linux	0s
test_windows (3.9, false, windows-2019)	15m 54s
test_windows (3.10, false, windows-2019)	15m 26s
test_windows (3.11, false, windows-2019)	15m 3s
test_windows (3.12, false, windows-2019)	14m 5s
test_windows (3.13, false, windows-2019)	14m 0s
upload_windows	0s
Clean up anaconda packages	0s
	11h 8m 8s

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