Update package.json

[jacoblukewood]

Required for Vite as per vitejs/vite#1505

#4725 added the exports as needed but this one was missing and did not allow projects such as those using SvelteKit to build.

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[Feiyang1]

Thanks for the contribution! I don't think it's needed though, because you will never use firebase as an import in v9. Instead, you will only use submodule imports like firebase/app, firebase/firestore, etc. As a result, we deliberately didn't add the exports for the main module to prevent people from importing from firebase.

I have tested the v9 SDK with sveltekit and it worked correctly. If it is not the case, can you help me understand your use case?