[Paddle-TRT]Fix cast bug

[zhoutianzi666]

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Describe

layer->getOutput()->setType() may fail, use layer->setOutputType() instead. in trt 8.4 setType fails， but ok in trt 8.2, so strange，so I use setOutputType() instead

[paddle-bot[bot]]

很抱歉，经过我们的反复讨论，你的PR暂未达到合入标准，请阅读飞桨原生算子开发规范，你可以重新提交新的PR，我们先将此PR关闭，感谢你的贡献。 Sorry to inform you that through our discussion, your PR fails to meet the merging standard (Reference: Paddle Custom Operator Design Doc). You can also submit an new one. Thank you.