chore(deps): update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -65,7 +65,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           flags: unittests