[Repo Assist] eng(tooling): correct isort py_version from 38 to 39

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Problem

The [tool.isort] section in pyproject.toml had py_version = 38 (Python 3.8) despite DoWhy officially requiring Python 3.9+ since at least the requires-python = ">=3.9" constraint in the same file. This inconsistency causes isort to sort imports as if targeting Python 3.8 when the actual minimum is Python 3.9.

Fix

Change py_version = 38 → py_version = 39 in [tool.isort] so isort's internal logic (e.g. which stdlib modules exist for the given Python version) matches the project's actual minimum.

This is a single-line tooling-only change. No runtime behaviour is affected.

Test Status

• ✅ black --check passes
• ✅ isort --check passes
• ✅ flake8 passes

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[!WARNING] Protected Files

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Protected files

• pyproject.toml

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