Release v0.21.0 #958

Job	Run time
list	22s
test (tests-3.9)	37s
test (tests-3.10)	49s
test (tests-pypy3.10)	57s
test (tests-3.11)	52s
test (tests-3.12)	34s
test (tests-3.13)	34s
test (audit)	49s
test (build)	51s
test (style)	16s
test (typing)	45s
test (docs(dirhtml))	51s
test (docs(doctest))	48s
test (docs(linkcheck))	54s
test (docs(man))	59s
test (docs(spelling))	51s
test (docs(style))	33s
macos (x86_64)	1m 27s
sdist	30s
macos (aarch64)	1m 31s
musllinux (aarch64-unknown-linux-musl)	1m 46s
manylinux (x86_64)	1m 57s
musllinux (i686-unknown-linux-musl)	1m 21s
manylinux (x86)	2m 1s
musllinux (x86_64-unknown-linux-musl)	1m 48s
windows (x64)	4m 51s
manylinux (aarch64)	1m 51s
windows (x86)	4m 59s
manylinux (armv7)	2m 5s
manylinux (s390x)	2m 0s
manylinux (ppc64le)	1m 58s
release	0s
	42m 27s

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