⬆️ Update mypy to v2.3.1

[cmgrayb]

This PR updates code quality tools in both requirements-dev.txt and pyproject.toml.

Renovate will automatically keep both files synchronized.

Tools updated:

Post-merge checklist:

• Verify all quality checks pass with new versions
• Update Copilot instructions with new version numbers if needed

[github-actions]

🔄 CI Pipeline Started

CI checks are running for this PR. Individual workflows will report their status:

Running Checks

• 🔄 Code Quality Checks (formatting, linting, type checking, full test suite across Python 3.10-3.14)
• 🔄 Build and Package Test (cross-platform installation testing)
• 🔄 Security Scan (vulnerability detection with Bandit)

Test Coverage

• ✅ Unit Tests: All core functionality
• ✅ Integration Tests: Real API interaction patterns
• ✅ Coverage Requirement: 80%+ maintained
• ✅ Multi-Python: Tested on Python 3.10, 3.11, 3.12, 3.13, 3.14

Please wait for all checks to complete before merging.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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