fix project.license SetuptoolsDeprecationWarning

[ghilesmeddour]

Use SPDX valid license names.
Use project.license-files instead of deprecated project.license.file.
Bump setuptools requirement to >=77.0.

Fixes #126

[Copilot]

Pull Request Overview

This PR updates the project license configuration to use SPDX-compliant license identifiers and addresses SetuptoolsDeprecationWarning by adopting the modern PEP 621 license field syntax.

• Replaces verbose license names with official SPDX identifiers (e.g., "MIT license" → "MIT", "Apache Software License 2.0" → "Apache-2.0")
• Migrates from deprecated [project.license] table format to inline license field with license-files array
• Bumps minimum setuptools requirement from >=61.0 to >=77.0 to ensure compatibility with the new license syntax

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cookiecutter/v2/cookiecutter.json	Updated license options to use SPDX identifiers instead of verbose names
templates/v2/template/pyproject.toml	Replaced [project.license] table with inline license = "MIT" and license-files array; bumped setuptools to >=77.0
templates/v2/template-reactless/pyproject.toml	Applied same license syntax modernization and setuptools version bump as template variant
.github/replay-files/v2/template.json	Updated replay file to use "MIT" instead of "MIT license" for consistency
.github/replay-files/v2/template-reactless.json	Updated replay file to use "MIT" instead of "MIT license" for consistency

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[sfc-gh-bnisco]

Thanks for filing and fixing this. I have 1 suggestion inline, but should be good to go after!