Set Papilo back to the main branch

[nguidotti]

Set Papilo back to the main branch as the issue related with DualInfer reduction has been fixed. See scipopt/papilo#89.

Closes #1585.

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

[coderabbitai]

📝 Walkthrough

Walkthrough

The CMake configuration now fetches Papilo from the upstream SCIPOpt repository at a pinned commit. Previous fork-specific comments and the former commit reference were removed.

Changes

Papilo source update

Layer / File(s)	Summary
Update Papilo fetch source cpp/CMakeLists.txt	Papilo now uses the upstream SCIPOpt repository and commit 2f29bb6e4c4217d7d915da7e2936cd4ee1dddec2.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: akifcorduk, aliceb-nv, tmckayus

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change by stating that Papilo is set back to its main branch.
Description check	✅ Passed	The description explains the Papilo update, the DualInfer fix, the linked issue, and the completed checks.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

CI Test Summary

8 failed · 23 passed · 0 skipped

[jameslamb]

approving for ci-codeowners