Aligns MANIFEST.in to template #558

Job	Run time
build macos-latest (x86_64) wheels	2m 20s
Build sdist	12s
build macos-latest (arm64) wheels	59s
build windows-latest (AMD64) wheels	3m 10s
build ubuntu-latest (x86_64) wheels	8m 22s
Show artifacts	3s
Publish to PyPI	0s
Publish to Test PyPI	0s
	15m 6s

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