👷 Upgrade Codecov GitHub Action (#304)

Author: tiangolo

.github/workflows/test.yml

@@ -59,4 +59,4 @@ jobs:
       - name: Test
         run: python -m poetry run bash scripts/test.sh
       - name: Upload coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2