Verify Celery 5.6.3 compatibility #890

Job	Run time
Build source distribution	11s
Build pure python wheels (3.14)	12s
Build python 3.8+ manylinux_2_28 wheels	13m 48s
Build macos wheels (cross-compiles arm64)	6m 10s
Build python 3.8+ manylinux2014 wheels	12m 41s
upload_pypi	25s
	33m 27s

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