update actions/upload-pages-artifact version (#196)

Author: Ig-dolci

.github/workflows/docs.yml

@@ -44,7 +44,7 @@ jobs:
           cd docs
           make html
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./docs/build/html