Bump actions/upload-pages-artifact from 1 to 3

Author: Robert-96

.github/workflows/docs.yml

@@ -90,7 +90,7 @@ jobs:
 
     - name: Upload artifact
       if: github.ref == 'refs/heads/main'
-      uses: actions/upload-pages-artifact@v1
+      uses: actions/upload-pages-artifact@v3
       with:
         path: 'docs/_build/html/'