Remove skip-existing flag from PyPI package publishing step

Author: MatthewCane

.github/workflows/publish.yml

@@ -24,8 +24,6 @@ jobs:
 
       - name: Publish package to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          skip-existing: true
 
   mkdocs-publish:
     name: Publish docs to GitHub Pages