Update another gh action

Author: AndyEveritt

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

@@ -63,7 +63,7 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for trusted publishing
     steps:
     - name: Download all the dists
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: python-package-distributions
         path: dist/