fix expired link in python onnxruntime readme (#1013)

Meng Wei

2023-10-17 8a16e1c13e91c9a7c43ba546fd71b85765d9469f

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#!/bin/bash
if [[ $OSTYPE == 'darwin'* ]]; then
  conda install -c conda-forge -y pynini=2.1.5
else
  pip install pynini==2.1.5
fi