Bump to PyO3 0.23.3, avoiding 0.23.x's previous soundness issues. #1023

Job	Run time
list	20s
test (tests-3.9)	1m 8s
test (tests-3.10)	1m 14s
test (tests-pypy3.10)	1m 0s
test (tests-3.11)	1m 7s
test (tests-3.12)	1m 8s
test (tests-3.13)	1m 12s
test (tests-3.13t)	57s
test (audit)	1m 2s
test (build)	1m 34s
test (style)	1m 2s
test (typing)	1m 17s
test (docs(dirhtml))	1m 8s
test (docs(doctest))	1m 14s
test (docs(linkcheck))	1m 6s
test (docs(man))	1m 45s
test (docs(spelling))	1m 18s
test (docs(style))	1m 15s
windows (x64)	4m 53s
manylinux (x86_64)	2m 44s
windows (x86)	3m 54s
macos (x86_64)	3m 49s
macos (aarch64)	3m 46s
musllinux (aarch64-unknown-linux-musl)	2m 22s
manylinux (x86)	3m 45s
musllinux (i686-unknown-linux-musl)	2m 38s
manylinux (aarch64)	2m 58s
musllinux (x86_64-unknown-linux-musl)	2m 30s
manylinux (armv7)	3m 2s
sdist	17s
manylinux (s390x)	3m 25s
windows-free-threaded (x64)	3m 50s
manylinux (ppc64le)	3m 15s
windows-free-threaded (x86)	4m 45s
release	0s
	1h 12m 40s

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