update upload-artifact action cause v3 is deprecated

Author: mruiz-ledger

.github/workflows/documentation.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Generate the documentation
         run: (cd doc && make html)
       - name: Upload documentation bundle
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: documentation
           path: doc/build/html/