Re-enable isort after upstream bug is addressed

[sijunhe]

PR types

PR changes

Description

Reference: PyCQA/isort#2083

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Merging #4577 (d5cdfd7) into develop (6a0c50c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #4577   +/-   ##
========================================
  Coverage    41.31%   41.32%           
========================================
  Files          433      433           
  Lines        61820    61826    +6     
========================================
+ Hits         25540    25548    +8     
+ Misses       36280    36278    -2     

Impacted Files	Coverage Δ
paddlenlp/transformers/bert/modeling.py	90.28% <100.00%> (+0.05%)	⬆️
paddlenlp/transformers/gpt/modeling.py	78.60% <100.00%> (+0.17%)	⬆️
paddlenlp/utils/downloader.py	59.01% <0.00%> (+0.81%)	⬆️

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