fix: Retry GET against 502, 503 responses

Author: kar0t

lib/trino/client/statement_client.rb

@@ -208,7 +208,8 @@ def faraday_get_with_retry(uri, &block)
             return response
           end
 
-          if response.status != 503  # retry only if 503 Service Unavailable
+          # retry if 502, 503, 504 according to the trino protocol
+          if response.status == 502 || response.status == 503 || response.status == 504
             # deterministic error
             exception! TrinoHttpError.new(response.status, "Trino API error at #{uri} returned #{response.status}: #{response.body}")
           end