BUILD: Remove attrs and referencing avoid versions

[SMoraisAnsys]

Description

Due to a change in some packages to follow PEP 639, we had issues with the license check action and had to avoid some versions of third party dependencies (attrs and referencing). With multiple efforts in twine, pypa/gh-action-pypi-publish and new releases of attrs and referencing, we can unpin the packages from the pyproject.toml file.

Issue linked

Associated to python-attrs/attrs#1386 and python-jsonschema/referencing#213

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[SMoraisAnsys]

Moving to draft since pip-licenses does not work with the new metadata associated to PEP 639, see #5697