How to fix ModuleNotFoundError: No module named 'execnet'

ModuleNotFoundError: No module named 'execnet'
Recommended: Install via pip into your active environment.
python -m pip install execnet

Verification

Command
python -c "import execnet; print(execnet.__version__)"
Expected output
Success! execnet version x.y.z (e.g., 2.4.0)