Update python-package.yml

provide SHARK IREE release links

.github/workflows/python-package.yml

@@ -29,7 +29,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        if [ -f requirements.txt ]; then pip install -r requirements.txt --extra-index-url https://download.pytorch.org/whl/nightly/cpu  -f https://github.com/llvm/torch-mlir/releases -f https://github.com/NodLabs/SHARK/releases; fi
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names