[Tests] Retry on 408 for Serverless since inference is timing out

Author: picandocodigo

elasticsearch-api/spec/yaml-test-runner/run.rb

@@ -62,7 +62,7 @@ def serverless?
 if serverless?
   options.merge!(
     {
-      retry_on_status: [409, 400, 503],
+      retry_on_status: [408, 409, 400, 503],
       retry_on_failure: 20,
       delay_on_retry: 10_000,
       request_timeout: 120