fix: json utils error with different python version

[drunkpig]

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Motivation

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Modification

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Checklist

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• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
llm_web_kit/input/datajson.py	50.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

@@            Coverage Diff             @@
##              dev     #291      +/-   ##
==========================================
- Coverage   89.92%   89.56%   -0.37%     
==========================================
  Files          85       82       -3     
  Lines        5630     5547      -83     
==========================================
- Hits         5063     4968      -95     
- Misses        567      579      +12     

Files with missing lines	Coverage Δ
llm_web_kit/input/datajson.py	89.87% <50.00%> (-0.26%)	⬇️

... and 13 files with indirect coverage changes

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