Prepare 20.1.0 release. #1408

Job	Run time
ruff	10s
mypy	26s
sdist	1m 10s
parse_sdl (windows-latest, 3.2.16)	46s
parse_sdl (macos-latest, 3.2.16)	35s
tox (ubuntu-latest)	2m 15s
test-docs	2m 1s
pyodide	2m 41s
build-macos (cp310-*_universal2)	2m 17s
build-macos (cp314t-*_universal2)	3m 14s
build-macos (pp310-*)	4m 3s
linux-wheels (x86_64, pp310-manylinux*)	3m 35s
linux-wheels (aarch64, cp314t-manylinux*)	4m 17s
linux-wheels (aarch64, cp310-manylinux*)	4m 22s
linux-wheels (x86_64, cp314t-manylinux*)	4m 8s
linux-wheels (aarch64, pp310-manylinux*)	3m 44s
linux-wheels (x86_64, cp310-manylinux*)	4m 13s
build (ubuntu-latest, pypy-3.10, x64)	3m 5s
build (windows-11-arm, 3.14t, arm64)	4m 38s
build (windows-latest, 3.10, x64)	3m 42s
build (windows-latest, 3.14t, x64)	3m 57s
build (windows-latest, 3.14t, x86)	3m 58s
build (windows-11-arm, 3.11, arm64)	4m 35s
build (ubuntu-latest, 3.10, x64)	3m 53s
build (ubuntu-latest, 3.14t, x64)	7m 37s
build (windows-latest, 3.10, x86)	4m 16s
build (windows-latest, pypy-3.10, x64)	4m 13s
publish	-1s
	1h 27m 50s

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