Merge pull request #90 from Pyomo/pypa_gah_update

Update publish-to-test-pypi.yml

Author: bknueven

.github/workflows/publish-to-test-pypi.yml

@@ -19,13 +19,13 @@ jobs:
       run: | 
         python3 setup.py sdist bdist_wheel
     - name: Publish distribution to Test PyPI
-      uses: pypa/gh-action-pypi-publish@main
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         password: ${{ secrets.test_pypi_password }}
         repository_url: https://test.pypi.org/legacy/
         skip_existing: true
     - name: Publish distribution to PyPI
       if: startsWith(github.ref, 'refs/tags')
-      uses: pypa/gh-action-pypi-publish@main
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         password: ${{ secrets.pypi_password }}