update macos build image to macos-15 (#831) #846

Job	Run time
Build source distribution	9s
Build macos wheels (cross-compiles arm64)	5m 10s
Build python 3.8+ manylinux_2_28 wheels	14m 23s
Build python 3.8+ manylinux2014 wheels	13m 48s
Build pure python wheels (3.14)	12s
upload_pypi	32s
	34m 14s

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