CI: Fix nightly doc build (temporary)

[SMoraisAnsys]

Description

Follow up of #6672 should be reverted in #6673 when everything is working back on track.

Issue linked

None

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.05%. Comparing base (fd6f543) to head (d7e155b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6684      +/-   ##
==========================================
- Coverage   83.05%   83.05%   -0.01%     
==========================================
  Files         244      244              
  Lines       77846    77846              
==========================================
- Hits        64653    64652       -1     
- Misses      13193    13194       +1     

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