Add Python 3.13.9 support to CI workflows with conditional NumPy dependencies

[Copilot]

Adds Python 3.13.9 testing to CI workflows with conditional NumPy version dependencies to ensure compatibility across all supported Python versions.

Changes

• Add Python 3.13.9 to test matrix in merge.yaml and push.yaml with NumPy 2.1.0
• Retain Python 3.11 and 3.12 with NumPy 1.26.4 for all pip-based jobs (setup, test, lint)
• Add conditional NumPy dependencies in setup.py:
  • NumPy 1.26.4+ for Python < 3.13 (NumPy 1.26.4 supports Python 3.9-3.12)
  • NumPy 2.1.0+ for Python >= 3.13 (NumPy 2.1.0 adds Python 3.13 support)
• Test all Python versions on both Ubuntu 24.04 and Windows 2025

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[benoit-cty]

@copilot Your goal is to make the CI test Python 3.13.9, so you have to add a conditional dependency to allow Numpy to work with Python >=3.13.

[Copilot]

@copilot Your goal is to make the CI test Python 3.13.9, so you have to add a conditional dependency to allow Numpy to work with Python >=3.13.

Fixed in 7bdf02c. Added Python 3.13.9 to the CI with NumPy 2.1.0. The setup.py now has conditional NumPy dependencies: NumPy 1.26.4+ for Python <3.13 and NumPy 2.1.0+ for Python >=3.13. All CI jobs (setup, test, lint) now test against Python 3.11, 3.12, and 3.13.9 on both Ubuntu and Windows.