fix: add types exports declaration for ./locales/*

[disintegrator]

Fixes #2698 #1461

This change fixes an issue that prevented Zod from being build and served through the Skypack CDN. Namely, Skypack was unable to resolve the declaration file lib/locales/en.d.ts because it was not exposed by the package.json#exports declaration.

I was able to verify this fix by publishing this branch to NPM (link) and comparing the result of the following in a Chrome console:

const z = await import ('https://cdn.skypack.dev/zod')
const zfixed = await import ('https://cdn.skypack.dev/@disintegrator/zod')

There was also a hint from other issues that Zod v3.18.x worked through Skypack but 3.19.0 did not. The latter is where the malformed exports declaration for ./locales/* was introduced.

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