Update SDL to 2.28.1 #751

Job	Run time
black	8s
mypy	32s
sdist	1m 0s
isort	6s
parse_sdl (windows-latest, 2.0.14)	48s
parse_sdl (windows-latest, 2.0.16)	54s
parse_sdl (macos-latest, 2.0.14)	47s
parse_sdl (macos-latest, 2.0.16)	44s
linux-wheels (x86_64, cp38-manylinux*)	3m 18s
linux-wheels (x86_64, pp38-manylinux*)	2m 52s
linux-wheels (aarch64, cp38-manylinux*)	15m 40s
linux-wheels (aarch64, pp38-manylinux*)	19m 43s
build-macos (cp38-*_universal2)	8m 7s
build-macos (cp38-*_x86_64)	4m 3s
build-macos (cp38-*_arm64)	3m 59s
build-macos (pp38-*)	6m 40s
build (ubuntu-latest, 3.8, x64)	4m 42s
build (ubuntu-latest, 3.9, x64)	3m 27s
build (ubuntu-latest, pypy-3.8, x64)	3m 26s
build (windows-latest, 3.8, x64)	4m 6s
build (windows-latest, 3.9, x64)	4m 56s
build (windows-latest, pypy-3.8, x64)	8m 43s
build (windows-latest, 3.8, x86)	5m 52s
build (windows-latest, pypy-3.8, x86)	7m 37s
test-docs	1m 42s
isolated (ubuntu-latest)	1m 37s
isolated (windows-latest)	2m 12s
publish	0s
	1h 57m 41s

Provide feedback