revert quarto upgrade

[jackgerrits]

Why are these changes needed?

The new version has another bug that needs to be fixed before we can upgrade (quarto-dev/quarto-cli#8961)

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[sonichi]

Please fix the code formatting error.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.90%. Comparing base (f2e4232) to head (0d1483f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1840   +/-   ##
=======================================
  Coverage   35.90%   35.90%           
=======================================
  Files          63       63           
  Lines        6637     6637           
  Branches     1456     1456           
=======================================
  Hits         2383     2383           
  Misses       4063     4063           
  Partials      191      191           

Flag	Coverage Δ
unittests	35.90% <ø> (ø)

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