update release env-var following secret renaming

Author: strickvl

.github/workflows/publish-pypi-package.yml

@@ -31,7 +31,7 @@ jobs:
       - name: publish
         env:
           PYPI_USERNAME: ${{ secrets.PYPI_USERNAME }}
-          PYPI_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+          PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
         run: |
           if [ "$(cat src/mlstacks/VERSION)" = "$(echo ${GITHUB_REF} | sed 's|refs/tags/||g')" ];
           then ./scripts/publish.sh;