fix(dataEvents): widen event metadata typing beyond string

Event metadata accepts string, number, date, link, rich link, and monetary
amount values (per public docs and server-side handling in
Events::MetadataFormatter), but the preview OpenAPI schema restricts it to
additionalProperties.type: string, generating metadata as Record<string, string>
in intercom-node's unstable resources. Widen to additionalProperties: true so
generated SDKs type it as Record<string, unknown>.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: pkubicki

fern/preview-openapi-overrides.yml

@@ -114,6 +114,16 @@ components:
     custom_attributes:
       example:
         monthly_spend: '155.5'
+    # event metadata accepts string, number, date, link, rich link, and monetary
+    # amount values, not just strings — widen from additionalProperties.type: string
+    create_data_event_request:
+      properties:
+        metadata:
+          additionalProperties: true
+    data_event:
+      properties:
+        metadata:
+          additionalProperties: true
     create_ticket_request:
       x-fern-type-name: CreateTicketRequestBody
       properties: