Close StatementClient when hitting client-side timeout

Author: takezoe

lib/trino/client/statement_client.rb

@@ -233,13 +233,15 @@ def raise_if_timeout!
         elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - @started_at
 
         if @query_timeout && elapsed > @query_timeout
+          close
           raise_timeout_error!
         end
 
         if @plan_timeout && (@results == nil || @results.columns == nil) &&
             elapsed > @plan_timeout
           # @results is not set (even first faraday_get_with_retry isn't called yet) or
           # result from Trino doesn't include result schema. Query planning isn't done yet.
+          close
           raise_timeout_error!
         end
       end