[Fix] fix dtype of pytorch2onnx

[Z-Fran]

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Motivation

Fix the error RuntimeError: "upsample_bicubic2d" not implemented for 'Byte'

Modification

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BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
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Use cases (Optional)

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Checklist

Before PR:

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• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

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[codecov]

Codecov Report

Base: 88.98% // Head: 88.98% // No change to project coverage 👍

Coverage data is based on head (205f6ff) compared to base (e7f9c3e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #1629   +/-   ##
========================================
  Coverage    88.98%   88.98%           
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  Files          400      400           
  Lines        26072    26072           
  Branches      4043     4043           
========================================
  Hits         23199    23199           
  Misses        1974     1974           
  Partials       899      899           

Flag	Coverage Δ
unittests	88.98% <ø> (ø)

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