Re-attempt fixing doc generation on main

`dawidd6/action-download-artifact@v2` can't find the doc artifact, not
sure why. But we don't need to use that anymore, we can use the
default GitHub artifact download action now that we're uploading and
downloading the artifact from the same workflow.

Author: jbourassa

.github/actions/publish-doc/action.yml

@@ -7,12 +7,10 @@ runs:
         ref: gh-pages
 
     - name: Download docs
-      uses: dawidd6/action-download-artifact@v2
+      uses: actions/download-artifact@v3
       with:
         name: doc
         path: doc
-        workflow: ci.yml
-        run_id: ${{ github.run_id }}
 
     - name: Current doc dir
       id: doc-dir