Update Python environment to 3.13 and refresh dependencies

[PyYoshi]

This commit updates the project to officially support Python 3.13.

Key changes include:

• Added Python 3.13 classifier to pyproject.toml.
• Updated Ruff linting target to py313 in pyproject.toml.
• Set Python version in the GitHub Actions build.yaml workflow to "3.13".
• Updated the test matrix in test.yaml to use stable Python "3.13" instead of "3.13-dev".
• Updated development dependencies to their latest versions:
  • Cython (3.0.10 -> 3.1.1)
  • Pytest (8.2.1 -> 8.3.5)
  • Ruff (0.4.6 -> 0.11.10)
  • Setuptools (70.0.0 -> 80.8.0)
• Ensured chardet is at its latest version (5.2.0).
• Updated pinned Cython version in cibuildwheel configuration in pyproject.toml.

These changes ensure the project is tested and built with the latest Python version and utilizes up-to-date development tooling.