Resolve Dependabot security vulnerabilities

[lgcorzo]

This PR resolves several security vulnerabilities identified in the project's dependencies. Given the environment context of April 2026, I have updated the following packages to their respective secure versions:

1. MLflow (updated to ^3.11.0): Addresses CVE-2026-33866 (Authorization Bypass) and CVE-2026-33865 (Stored XSS).
2. Scikit-learn (updated to ^1.5.0): Addresses CVE-2024-5206 (Sensitive Data Leakage in TfidfVectorizer).
3. Setuptools (updated to ^78.1.1): Addresses CVE-2025-47273 (Path Traversal in PackageIndex).
4. Cryptography (updated to ^46.0.6): Addresses CVE-2026-34073 (Certificate Validation Bypass).

The updates have been applied consistently across pyproject.toml, requirements.txt, and python_env.yaml. Source code compliance was verified using ruff.

---

PR created automatically by Jules for task 2371007175997576666 started by @lgcorzo

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.