[py] Use SPDX license expression for project metadata

[cdce8p]

User description

Motivation and Context

PEP 639 added the support for SPDX license expressions in the project metadata. Setuptools v77 just added support for it.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement

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Description

• Updated project metadata to use SPDX license expressions.

• Increased setuptools version requirement to >=77.0.

• Removed redundant license classifier from project metadata.

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Changes walkthrough 📝

	Relevant files
Enhancement	pyproject.toml Update project metadata for SPDX and setuptools                    py/pyproject.toml Updated license field to use SPDX expression. Increased setuptools version requirement to >=77.0. Removed redundant license classifier entry. +2/-3

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[cdce8p]

Unfortunately, I'm not signing a CLA just for a 3 line change in the metadata.
Going to close this one but please feel free to reuse any part of it if you like.