Fix import check_matplotlib_support and update requirements

[PyPaperParrot]

---

name: "Pull request"
about: Make changes in scikit-uplift

📑 Description of the Change

• Fix import check_matplotlib_support: in scikit-learn>=1.5, the check_matplotlib_support method is located in utils._optional_dependencies
• Update requirements.txt: scikit-learn>=1.5.0

[PyPaperParrot]

btw, you may prefer to implement alternative solution. Just add upper bound for scikit-learn version: less than 1.5