add support for PEP 639 License Clarity

[radoering]

Pull Request Check List

Requires: python-poetry/poetry-core#870
Resolves: #9670

• Added tests for changed code (see poetry-core PR).
• Updated documentation for changed code.

Summary by Sourcery

Add support for PEP 639 license clarity by simplifying license specification, introducing a license-files field with default glob patterns, and updating documentation, tests, and dependency references accordingly.

New Features:

• Introduce license-files field in pyproject.toml for specifying license file patterns with configurable defaults

Enhancements:

• Deprecate table-based license specification in favor of simple string identifiers
• Define default license file globs included in distributions and allow overriding by an empty list

Documentation:

• Update pyproject.md and libraries.md to document the license-files field and deprecation of table syntax
• Clarify default license-related files included in wheel and sdist builds

Tests:

• Add warning for deprecated or invalid SPDX license identifiers in the check command
• Update test fixtures to use string-based license fields instead of tables

[sourcery-ai]

Reviewer's Guide

Implement PEP 639 license clarity by deprecating the old table-based license syntax, introducing the new license-files field (with defaults and override behavior), updating related warnings and documentation, adjusting the poetry-core dependency to the PEP 639 branch, and updating tests and fixtures to reflect the new license model.

File-Level Changes

Change	Details	Files
Revise license configuration to align with PEP 639	Deprecate { text = … }/{ file = … } table syntax for license Introduce license-files list with default glob patterns and override semantics Add warnings and notes about deprecation, default behavior, and empty-list handling Remove outdated proprietary-license note Adjust classifiers warning to drop automatic license mention	docs/pyproject.md docs/libraries.md
Point poetry-core dependency to PEP 639 branch	Update poetry-core reference to use the pep639 branch in pyproject.toml	pyproject.toml
Update tests and fixtures for new license syntax	Add a warning in test_check for invalid SPDX identifiers Replace table-based license entries with string syntax in fixture pyproject.toml files	tests/console/commands/test_check.py tests/fixtures/invalid_pyproject/pyproject.toml tests/fixtures/simple_project/pyproject.toml

Possibly linked issues

• Implement PEP 639 #9670: Updates poetry-core dependency to a version with the fix for the file inclusion regression.

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