fix text ut error

[shenchucheng]

Features

• Fix the unittest error in tests/metagpt/utils/test_text.py caused by the max token change of the gpt-3.5-turbo model.
• Prevent excessive output if the test_text.py unittest fails.

Result

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.13%. Comparing base (cc6708a) to head (f91334d).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1049      +/-   ##
==========================================
+ Coverage   81.86%   82.13%   +0.26%     
==========================================
  Files         246      246              
  Lines       13734    13734              
==========================================
+ Hits        11243    11280      +37     
+ Misses       2491     2454      -37     

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[garylin2099]

corresponding tests passed, LGTM