Fix Ubuntu packaging failure by aligning cibuildwheel config with Python version requirement

[jeongyoonlee]

Summary

• Fixed Ubuntu packaging failure in v0.15.6 by aligning the cibuildwheel configuration with the Python version requirement
• Removed Python 3.9 and 3.10 from the build matrix since the package requires Python >=3.11

Problem

The GitHub Actions workflow for Ubuntu packaging was failing because:

1. pyproject.toml specifies requires-python = ">=3.11"
2. But [tool.cibuildwheel] was configured to build wheels for cp39-* and cp310-*
3. This version mismatch causes cibuildwheel to fail validation

Solution

Updated the cibuildwheel build configuration to only include Python versions 3.11 and 3.12:

[tool.cibuildwheel]
build = ["cp311-*", "cp312-*"]

Test plan

• Package builds successfully with uv pip install -e .
• Core imports work correctly
• Code formatted with black
• GitHub Actions workflow will verify wheel building on all platforms

Fixes #863

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes a packaging failure in Ubuntu builds by removing Python 3.9 and 3.10 from the cibuildwheel configuration, aligning it with the project's minimum Python version requirement of 3.11.

Changes:

• Updated [tool.cibuildwheel] build configuration to only include Python 3.11 and 3.12

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