Add python 3.12

[hanjinliu]

Summary by CodeRabbit

Release Notes for the Pull Request:

• New Feature: Enhanced code editor in magicclass/widgets/codeedit.py to automatically insert a new line with appropriate indentation based on the context.
• Bug Fix: Improved error handling and resource management in magicclass/widgets/logger.py and magicclass/widgets/plot.py by adding OSError to the suppress context manager and closing all open figures before changing the backend, respectively.
• Refactor: Updated magicclass/fields/_fields.py to check if attribute name exists in the owner class's annotations before assignment, preventing potential errors.
• Test: Switched from using typing.Annotated to typing_extensions.Annotated in tests/test_fields.py for type hinting.
• Chore: Updated CI/CD configuration in .github/workflows/test.yml to include Python version 3.12.

[coderabbitai[bot]]

Walkthrough

This update brings enhancements to the codebase, focusing on error handling, resource management, and compatibility. It introduces support for Python 3.12 in CI/CD, improves parentheses matching logic, handles additional exceptions, manages plot resources better, and ensures attribute existence before assignment. The use of typing_extensions module is also noted.

Changes

File	Summary
.github/workflows/test.yml	Added support for Python 3.12 in the CI/CD configuration.
magicclass/widgets/codeedit.py	Improved parentheses matching logic in _new_line_event method.
magicclass/widgets/logger.py, magicclass/widgets/plot.py	Enhanced error handling and resource management by suppressing OSError and closing all plots before backend switch.
magicclass/fields/_fields.py	Ensured attribute existence in __set_name__ method before assignment.
tests/test_fields.py	Switched from typing.Annotated to typing_extensions.Annotated.

🐇💻

Code changes here, code changes there,

With each pull request, we show we care.

From handling errors to managing plots,

We're improving our code, connecting the dots.

So here's to the devs, with their keyboards a-tap,

Making magic happen, one code snap after snap! 🎉

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