Normalize newlines in requirements.txt #942

Job	Run time
sdist	33s
ruff	5s
mypy	24s
tox (ubuntu-latest)	1m 23s
tox (windows-latest)	1m 32s
parse_sdl (windows-latest, 2.0.14)	37s
parse_sdl (windows-latest, 2.0.16)	32s
build-macos (cp38-*_universal2)	5m 40s
parse_sdl (macos-latest, 2.0.14)	27s
linux-wheels (x86_64, cp38-manylinux*)	2m 11s
build (ubuntu-latest, 3.8, x64)	2m 28s
build-macos (pp38-*)	4m 43s
parse_sdl (macos-latest, 2.0.16)	23s
linux-wheels (x86_64, pp38-manylinux*)	1m 56s
build (ubuntu-latest, pypy-3.8, x64)	2m 36s
linux-wheels (aarch64, cp38-manylinux*)	10m 38s
build (windows-latest, 3.8, x64)	3m 22s
linux-wheels (aarch64, pp38-manylinux*)	9m 22s
build (windows-latest, pypy-3.8, x64)	4m 30s
test-docs	1m 13s
build (windows-latest, 3.8, x86)	2m 55s
build (windows-latest, pypy-3.8, x86)	4m 53s
publish	0s
	1h 2m 23s

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