Normalize newlines in requirements.txt #944

Job	Run time
ruff	21s
mypy	25s
sdist	41s
tox (ubuntu-latest)	1m 28s
tox (windows-latest)	2m 25s
build (ubuntu-latest, 3.8, x64)	2m 40s
build (ubuntu-latest, pypy-3.8, x64)	2m 37s
parse_sdl (windows-latest, 2.0.14)	34s
build (windows-latest, 3.8, x64)	3m 50s
build-macos (cp38-*_universal2)	5m 32s
parse_sdl (windows-latest, 2.0.16)	41s
linux-wheels (x86_64, cp38-manylinux*)	2m 8s
build (windows-latest, pypy-3.8, x64)	4m 48s
build-macos (pp38-*)	5m 27s
parse_sdl (macos-latest, 2.0.14)	31s
linux-wheels (x86_64, pp38-manylinux*)	2m 7s
build (windows-latest, 3.8, x86)	4m 38s
parse_sdl (macos-latest, 2.0.16)	23s
linux-wheels (aarch64, cp38-manylinux*)	10m 29s
build (windows-latest, pypy-3.8, x86)	4m 10s
linux-wheels (aarch64, pp38-manylinux*)	10m 16s
test-docs	1m 16s
publish	0s
	1h 7m 27s

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