build: drop py3.8

[nstarman]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Files           ?         1           
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  Hits            ?        16           
  Misses          ?         0           
  Partials        ?         0           

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[Copilot]

Pull request overview

This PR drops support for Python 3.8, raising the minimum Python version to 3.9. The changes also modernize the project's build and test infrastructure by migrating from project.optional-dependencies to PEP 735 dependency-groups, adopting nox-uv for test automation, and updating various development dependencies to their latest versions.

Key Changes

• Minimum Python version increased from 3.8 to 3.9 across all configuration files
• Development dependencies migrated from project.optional-dependencies to PEP 735 dependency-groups
• Test automation refactored to use nox-uv with uv dependency groups integration

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
pyproject.toml	Updated Python version requirements (3.8→3.9), removed 3.8 classifier, updated mypy/pylint config, migrated to dependency-groups, updated dev dependencies
noxfile.py	Refactored to use nox-uv with uv_groups parameter, reorganized sessions with better structure and comments
.pre-commit-config.yaml	Added codespell configuration with TOML support
.github/workflows/ci.yml	Updated Python version matrix (3.8→3.9), migrated to uv-based workflow, added CI status check job

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