bug: Add "content" block to lke node pool recycle POST

The absence of this is breaking CLI builds.  The CLI builds as expected
with this included.  This is probably also more correct, as the API
appears to return a `{}` as the body for a 200 response from this endpoint.

Author: Dorthu

openapi.yaml

@@ -6755,6 +6755,10 @@ paths:
       responses:
         '200':
           description: Node Pool has been recycled.
+          content:
+            application/json:
+              schema:
+                type: object
         default:
           $ref: '#/components/responses/ErrorResponse'
       x-code-samples: