chore: configure mypy to use python 3.14

[ohmayr]

See #2541 for the diff.

[gemini-code-assist]

Summary of Changes

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This pull request updates the mypy configuration to specify Python version 3.14 for static type checking. This change ensures that the type checker leverages the latest Python features and syntax, helping to maintain code quality and compatibility with newer Python environments.

Highlights

• Mypy Configuration Update: The python_version setting in mypy.ini has been updated from 3.8 to 3.14.

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[gemini-code-assist]

Code Review

This pull request updates the python_version in mypy.ini and several related template files to 3.14, aligning with the goal of bumping the mypy version. The noxfile.py has also been updated to include Python 3.14 in the ALL_PYTHON tuple. However, the gapic/ads-templates/mypy.ini.j2 file retains python_version = 3.7, which creates an inconsistency that should be addressed.