Update cython, other minors #1058

Job	Run time
build (ubuntu-py38-cython-checkbin)	11m 6s
build (windows-py314-cython)	7m 20s
build (ubuntu-py313-cython)	8m 6s
build (ubuntu-pypy3)	7m 35s
build (ubuntu-py311-cython)	7m 55s
build (windows-py313-cython)	7m 56s
build (windows-py39-cython)	10m 8s
build (windows-py311-cython)	8m 31s
build (windows-py310-cython-checkbin)	9m 34s
build (ubuntu-py314-cython)	7m 2s
build (ubuntu-py312-cython-checkbin)	10m 34s
build (windows-py312-cython-checkbin)	7m 57s
	1h 43m 44s

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