Add actions/checkout@v4 step to the test CI workflow before creating the virtual environment, and update pyproject.toml version to 1.39.0 with corresponding CHANGELOG entry documenting the virtual environment test isolation improvement.
Add actions/checkout@v4 step to the test CI workflow before creating the virtual environment, and update pyproject.toml version to 1.39.0 with corresponding CHANGELOG entry documenting the virtual environment test isolation improvement.