ci: update actions/upload-artifact to v4

Co-authored-by: derrynknife <18457108+derrynknife@users.noreply.github.com>

Author: google-labs-jules[bot]

.github/workflows/actions.yml

@@ -33,7 +33,7 @@ jobs:
           coverage html
 
       - name: Upload coverage html report artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage-html-report
           path: htmlcov/