Remove outdated Mypy ignore #758

Job	Run time
mypy	27s
black	9s
sdist	1m 5s
isort	8s
test-docs	1m 49s
parse_sdl (windows-latest, 2.0.14)	52s
linux-wheels (x86_64, cp38-manylinux*)	1m 56s
parse_sdl (windows-latest, 2.0.16)	54s
build (ubuntu-latest, 3.8, x64)	3m 41s
linux-wheels (x86_64, pp38-manylinux*)	1m 56s
parse_sdl (macos-latest, 2.0.14)	36s
build-macos (cp38-*_universal2)	5m 22s
build (ubuntu-latest, 3.9, x64)	3m 33s
linux-wheels (aarch64, cp38-manylinux*)	1m 39s
build-macos (cp38-*_x86_64)	4m 17s
build (ubuntu-latest, pypy-3.8, x64)	5m 46s
linux-wheels (aarch64, pp38-manylinux*)	1m 56s
parse_sdl (macos-latest, 2.0.16)	33s
build (windows-latest, 3.8, x64)	4m 18s
build-macos (cp38-*_arm64)	3m 54s
build (windows-latest, 3.9, x64)	4m 19s
build-macos (pp38-*)	3m 36s
build (windows-latest, pypy-3.8, x64)	7m 35s
build (windows-latest, 3.8, x86)	4m 41s
build (windows-latest, pypy-3.8, x86)	5m 57s
isolated (ubuntu-latest)	2m 11s
isolated (windows-latest)	1m 53s
publish	0s
	1h 15m 3s

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