Update cython, other minors #1056

Job	Run time
build (ubuntu-py38-cython-checkbin)	11m 9s
build (windows-py311-cython)	8m 12s
build (ubuntu-pypy3)	6m 43s
build (ubuntu-py311-cython)	7m 59s
build (ubuntu-py312-cython-checkbin)	11m 6s
build (ubuntu-py314-cython)	7m 4s
build (windows-py310-cython-checkbin)	9m 23s
build (windows-py39-cython)	10m 26s
build (windows-py312-cython-checkbin)	7m 49s
build (ubuntu-py313-cython)	8m 20s
build (windows-py314-cython)	7m 13s
build (windows-py313-cython)	8m 5s
	1h 43m 29s

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