fix: include authors in ld+json

contentlayer.config.ts

@@ -87,7 +87,7 @@ export const Blog = defineDocumentType(() => ({
     draft: { type: 'boolean' },
     summary: { type: 'string' },
     images: { type: 'json' },
-    authors: { type: 'list', of: { type: 'string' } },
+    authors: { type: 'json' },
     layout: { type: 'string' },
     bibliography: { type: 'string' },
     canonicalUrl: { type: 'string' },