fix: config MultiSitemapsInput types

[reslear]

fix config MultiSitemapsInput types:

 Property 'index' is incompatible with index signature.
      Type '{ sitemap: string; }[]' has no properties in common with type 'Partial<SitemapDefinition>'.ts(2322)

[harlan-zw]

Thanks! Does this actually fix it though 🤔 seems like it wouldn't change the types (in theory)

[reslear]

typescript baby :) but i use this fix as a patch, works good :)

[harlan-zw]

Good enough for me 😅