Missing entry point in package.json

[Jack-Works]

react/packages/react/package.json

Line 32 in 3b3daf5

"./build-info.json": "./build-info.json",

This build-info.json is not published to npm.

https://www.jsdelivr.com/package/npm/react?version=18.0.0-rc.0

[bvaughn]

This is a left over artifact from the way our release script used to work. It shouldn't cause any problems, but if you'd like to submit a PR removing this entry that'd be okay too.