fix: Add setuptools as runtime dependency for Python 3.12+ compatibility

[yurekami]

Summary

• Adds setuptools >= 65.0.0 to runtime dependencies to fix Python 3.12+ compatibility
• Resolves ModuleNotFoundError: No module named 'distutils' error

Related Issue

Fixes #13

Background

The distutils module was deprecated in Python 3.10 (PEP 632) and completely removed in Python 3.12. The setuptools package provides a compatibility shim that makes distutils available for packages and dependencies that still rely on it.

While setuptools is already listed as a build-time dependency in [build-system].requires, it was not included as a runtime dependency. This caused issues for Python 3.12+ users when running smallpond, as some code paths (possibly from dependencies) still import from distutils.

Changes

Added setuptools >= 65.0.0 to the dependencies list in pyproject.toml:

dependencies = [
    "duckdb >= 1.2.0",
    "pyarrow ~= 16.1.0",
    "setuptools >= 65.0.0",  # Required for Python 3.12+ (distutils compatibility)
    ...
]

The minimum version of 65.0.0 was chosen as it includes robust distutils compatibility features.

Test plan

• Verify installation succeeds on Python 3.12+
• Verify import smallpond works without distutils errors
• Verify existing functionality is not affected

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