Update cython, other minors #1053

Job	Run time
build (ubuntu-py38-cython-checkbin)	4m 31s
build (windows-py39-cython)	9m 32s
build (windows-py313-cython)	7m 44s
build (ubuntu-py313-cython)	8m 40s
build (ubuntu-py314-cython)	7m 4s
build (windows-py314-cython)	8m 48s
build (windows-py312-cython-checkbin)	7m 59s
build (windows-py311-cython)	8m 15s
build (windows-py310-cython-checkbin)	2m 4s
build (ubuntu-py311-cython)	7m 47s
build (ubuntu-pypy3)	7m 5s
build (ubuntu-py312-cython-checkbin)	10m 55s
	1h 30m 24s

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