[Cherry-pick] Enforce version upper bound for scikit-learn. (#36948)

[shunping]

Fix python presubmit test failures in release branch.

see #36948 for details.

fixes #31285

[gemini-code-assist]

Summary of Changes

Hello @shunping, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses Python presubmit test failures on a release branch by introducing a specific upper version constraint for the scikit-learn package. This change, a cherry-pick from a previous fix, ensures compatibility and stability by preventing installations of scikit-learn versions that might cause issues with existing code.

Highlights

• Scikit-learn Version Constraint: An upper version bound of <1.8.0 has been added to the scikit-learn dependency in sdks/python/setup.py.

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