Upgrade worflow to node.js 16 for codecov/codecov-action

Author: kempa-liehr

.github/workflows/test.yml

@@ -102,4 +102,4 @@ jobs:
         if: ${{ always() }}
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v3