Use paddle.cast instead of Tensor.astype

[HydrogenSulfate]

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Description

相关PR：https://github.com/PaddlePaddle/Paddle/pull/69333/files#diff-0865d6eede2e320c86708a3faf581051af9087e731d64d9b38abcfb48ac694abR102-R103

暂时调用paddle.cast代替astype，避免因为dtype相同而跳过cast计算导致模型报错，等分布式修复后再改回去

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.77%. Comparing base (872aafa) to head (a6d5e4b).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/transformers/gpt/modeling_auto.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9461      +/-   ##
===========================================
- Coverage    53.00%   52.77%   -0.24%     
===========================================
  Files          680      679       -1     
  Lines       109563   108368    -1195     
===========================================
- Hits         58078    57188     -890     
+ Misses       51485    51180     -305     

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[wawltor]

LGTM