Fix lint ruff v0.15 using lambda

[cpaniaguam]

This pull request includes minor updates to dependencies and a small code simplification. The most notable changes are:

Dependency updates:

• Upgraded the minimum required version of the ruff linter from 0.9.1 to 0.15.0 in pyproject.toml to ensure compatibility with newer features and fixes.

Code simplification:

• Simplified the Add operation mapping in the pt_onnx_ops dictionary in onnx2pt.py by directly referencing onnx_add instead of wrapping it in a lambda function.

[digicosmos86]

LGTM!