fix: pin quarto version

[moe-ad]

Description

There is a breaking change with quarto v1.7.29 which workflows recently started installing. These are causing doc-build failures.

See https://github.com/ansys/pymapdl/actions/runs/14712614347/job/41288570436 for example.
Also see ansys/actions#791

Checklist

• I have visited and read Develop PyMAPDL.
• I have followed the PyMAPDL coding style guidelines.
• I have reviewed my changes before submitting this pull request.
• I have assigned this PR to myself.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.29%. Comparing base (9e64362) to head (a97cd20).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3876      +/-   ##
==========================================
- Coverage   88.33%   88.29%   -0.05%     
==========================================
  Files         187      187              
  Lines       14819    14819              
==========================================
- Hits        13091    13084       -7     
- Misses       1728     1735       +7     

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[clatapie]

Thanks for the quick fix @moe-ad!

[germa89]

Thank you @moe-ad !! :)