chore: remove multiple version docs build each time

[zhongjiajie]

Brief Summary of The Change

Pull Request checklist

I confirm that the following checklist has been completed.

• Add/Change test cases for the changes.
• Add/Change the related documentation, should also change docs/source/config.rst when you change file default_config.yaml.
• (Optional) Add your change to UPDATING.md when it is an incompatible change.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.51%. Comparing base (b0967c6) to head (2364f81).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   90.59%   90.51%   -0.08%     
==========================================
  Files          61       61              
  Lines        2308     2310       +2     
==========================================
  Hits         2091     2091              
- Misses        217      219       +2     

Flag	Coverage Δ
unittests	90.51% <100.00%> (-0.08%)	⬇️

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