Remove codecov token #1328

Job	Run time
ruff	10s
sdist	53s
mypy	25s
parse_sdl (macos-latest, 3.2.16)	26s
parse_sdl (windows-latest, 3.2.16)	58s
test-docs	2m 5s
build (ubuntu-latest, pypy-3.10, x64)	3m 20s
tox (ubuntu-latest)	2m 16s
build (ubuntu-latest, 3.10, x64)	3m 40s
build (windows-latest, 3.10, x64)	2m 54s
build-macos (cp310-*_universal2)	1m 56s
build (windows-latest, pypy-3.10, x64)	4m 11s
build-macos (pp310-*)	3m 56s
build (windows-latest, 3.10, x86)	4m 27s
pyodide	2m 53s
linux-wheels (x86_64, pp310-manylinux*)	3m 42s
linux-wheels (x86_64, cp310-manylinux*)	4m 9s
linux-wheels (aarch64, cp310-manylinux*)	4m 7s
linux-wheels (aarch64, pp310-manylinux*)	3m 42s
publish	0s
	50m 10s

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