Aligns MANIFEST.in to template #560

Job	Run time
Build sdist	13s
build macos-latest (x86_64) wheels	2m 57s
build ubuntu-latest (x86_64) wheels	8m 26s
build macos-latest (arm64) wheels	1m 40s
build windows-latest (AMD64) wheels	3m 43s
Show artifacts	3s
Publish to PyPI	-1s
Publish to Test PyPI	-1s
	17m 0s

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