Unclosed connection leak when replacing pooled connection in SharedTimedStack.try_create (#37335)

app/lib/connection_pool/shared_timed_stack.rb

@@ -71,6 +71,7 @@ class ConnectionPool::SharedTimedStack
       throw_away_connection = @queue.pop
       @tagged_queue[throw_away_connection.site].delete(throw_away_connection)
       @create_block.call(preferred_tag)
+      throw_away_connection.close
     elsif @created != @max
       connection = @create_block.call(preferred_tag)
       @created += 1