pyqt: migrate to python@3.14

[AdityaGarg8]

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[Copilot]

Pull Request Overview

This PR migrates the PyQt formula from Python 3.13 to Python 3.14 by updating the dependency specification and the internal python3 method reference.

• Updates the Python dependency from python@3.13 to python@3.14
• Updates the internal python3 method to return "python3.14" instead of "python3.13"

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[github-actions]

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[AdityaGarg8]

Not sure if revision 1 is needed here as well:

#249700