Upgrade to use SDL3 version of libtcod #982

Job	Run time
ruff	6s
sdist	9s
mypy	23s
tox (windows-latest)	10s
tox (ubuntu-latest)	11s
parse_sdl (windows-latest, 3.2.10)	28s
parse_sdl (macos-latest, 3.2.10)	21s
test-docs	8s
build (ubuntu-latest, pypy-3.8, x64)	30s
build (windows-latest, pypy-3.8, x86)	2m 56s
build-macos (pp38-*)	25s
build (windows-latest, 3.8, x64)	2m 37s
linux-wheels (x86_64, cp38-manylinux*)	45s
build (windows-latest, pypy-3.8, x64)	2m 51s
build (windows-latest, 3.8, x86)	3m 4s
build (ubuntu-latest, 3.8, x64)	27s
build-macos (cp38-*_universal2)	20s
linux-wheels (aarch64, cp38-manylinux*)	1m 0s
linux-wheels (x86_64, pp38-manylinux*)	59s
linux-wheels (aarch64, pp38-manylinux*)	59s
publish	0s
	18m 49s

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