fix(integration-templates): [nan-1327] add response_path (NangoHQ#2460)

## Describe your changes
Add response path for certn

## Issue ticket number and link
NAN-1327

## Checklist before requesting a review (skip if just adding/editing
APIs & templates)
- [ ] I added tests, otherwise the reason is: 
- [ ] I added observability, otherwise the reason is:
- [ ] I added analytics, otherwise the reason is:

packages/shared/providers.yaml

@@ -418,6 +418,7 @@ certn:
         paginate:
             type: link
             link_path_in_response_body: next
+            response_path: results
         verification:
             method: GET
             endpoint: /api/v2/teams