Prepare 16.1.1 release. #755

Job	Run time
black	8s
isort	7s
mypy	31s
sdist	1m 3s
parse_sdl (windows-latest, 2.0.14)	1m 2s
parse_sdl (windows-latest, 2.0.16)	50s
parse_sdl (macos-latest, 2.0.14)	44s
parse_sdl (macos-latest, 2.0.16)	42s
build (ubuntu-latest, 3.8, x64)	3m 42s
build (ubuntu-latest, 3.9, x64)	4m 13s
build (ubuntu-latest, pypy-3.8, x64)	3m 59s
build (windows-latest, 3.8, x64)	4m 36s
build (windows-latest, 3.9, x64)	4m 55s
build (windows-latest, pypy-3.8, x64)	5m 48s
build (windows-latest, 3.8, x86)	5m 15s
build (windows-latest, pypy-3.8, x86)	6m 8s
build-macos (cp38-*_universal2)	5m 12s
build-macos (cp38-*_x86_64)	4m 23s
build-macos (cp38-*_arm64)	3m 47s
build-macos (pp38-*)	3m 14s
linux-wheels (x86_64, cp38-manylinux*)	2m 52s
linux-wheels (x86_64, pp38-manylinux*)	2m 46s
linux-wheels (aarch64, cp38-manylinux*)	15m 23s
linux-wheels (aarch64, pp38-manylinux*)	13m 51s
test-docs	2m 20s
isolated (ubuntu-latest)	1m 35s
isolated (windows-latest)	1m 50s
publish	1m 10s
	1h 42m 6s

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