Release v0.21.0 #957

Job	Run time
list	17s
test (tests-3.9)	47s
test (tests-3.10)	45s
test (tests-pypy3.10)	52s
test (tests-3.11)	53s
test (tests-3.12)	37s
test (tests-3.13)	42s
test (audit)	36s
test (build)	38s
test (style)	20s
test (typing)	46s
test (docs(dirhtml))	1m 5s
test (docs(doctest))	54s
test (docs(linkcheck))	43s
test (docs(man))	46s
test (docs(spelling))	51s
test (docs(style))	27s
sdist	28s
musllinux (aarch64-unknown-linux-musl)	1m 37s
manylinux (x86_64)	1m 38s
musllinux (i686-unknown-linux-musl)	1m 38s
macos (x86_64)	1m 15s
manylinux (x86)	2m 0s
windows (x64)	4m 38s
musllinux (x86_64-unknown-linux-musl)	1m 28s
macos (aarch64)	1m 20s
manylinux (aarch64)	2m 2s
windows (x86)	4m 16s
manylinux (armv7)	2m 16s
manylinux (s390x)	1m 52s
manylinux (ppc64le)	2m 0s
release	3m 2s
	43m 29s

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