[cherry-pick]fix save tensor dtype (#2642)

[llbdyiu66]

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Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/v0.3@55e169c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
paddleformers/mergekit/merge_model.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@               Coverage Diff               @@
##             release/v0.3    #2646   +/-   ##
===============================================
  Coverage                ?   30.32%           
===============================================
  Files                   ?      305           
  Lines                   ?    52415           
  Branches                ?        0           
===============================================
  Hits                    ?    15897           
  Misses                  ?    36518           
  Partials                ?        0           

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