Replace deprecated pyproject license table + classifier

[netanelcyber]

Warning

python -m build emits SetuptoolsDeprecationWarnings on every build:

`project.license` as a TOML table is deprecated
License classifiers are deprecated

Deadline stated by setuptools: 2027-02-18 — builds break after that.

Fix

In pyproject.toml:

[project]
license = "MIT"
license-files = ["LICENSE"]

And remove "License :: OSI Approved :: MIT License" from classifiers.

Acceptance

• python -m build produces zero deprecation warnings
• PyPI still shows MIT license on the project page