Refactor CI workflow for PyPI and Conda: standardize job names, utili…

[rbeucher]

This pull request updates the continuous deployment workflow in .github/workflows/cd.yml to improve Python version support and streamline the build and publish process for both PyPI and Conda. The main changes include introducing a build matrix for multiple Python versions, separating the PyPI publishing step, and ensuring consistent deployment to Conda after PyPI publishing.

Python version matrix and workflow improvements:

• Added a build matrix to both the PyPI and Conda jobs to build and test with Python versions 3.11, 3.12, and 3.13, improving compatibility and release coverage.
• Modified the PyPI job to build distributions for each Python version, upload artifacts, and then publish the package in a separate job to avoid duplicate publishing and simplify artifact management.
• Updated the Conda job to depend on the new publish job (instead of PyPI), ensuring Conda deployment only occurs after PyPI publishing is complete.
• Updated the Conda setup step to use the matrix Python version for environment consistency across builds.

General workflow and naming improvements:

• Improved job and step naming for clarity and consistency, and updated action versions to recommended tags.…ze matrix for Python versions, and improve artifact handling