Update CI/CD

[vkbo]

Summary:

This PR:

• Adds Python 3.14 test coverage
• Updates actions/setup-python to v6
• Updates actions/checkout to v5

Related Issue(s):

Reviewer's Checklist:

• The header of all files contain a reference to the repository license
• The overall test coverage is increased or remains the same as before
• All tests are passing
• All linting checks are passing and the style guide is followed
• Documentation (as docstrings) is complete and understandable
• Only files that have been actively changed are committed