Update codecov-action version

Author: utapyngo

.github/workflows/test.yml

@@ -76,8 +76,9 @@ jobs:
         coverage run --branch --source=pytest_unordered -m pytest tests/
         coverage xml -o ./coverage.xml
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v2
+      uses: codecov/codecov-action@v4
       with:
         fail_ci_if_error: false
         files: ./coverage.xml
+        token: ${{ secrets.CODECOV_TOKEN }}
         verbose: true