Bump codecov/codecov-action from 1 to 2.0.1 (#316)

Author: dependabot[bot]

.github/workflows/ci-unit-tests.yml

@@ -56,6 +56,6 @@ jobs:
       run: make test_ci
 
     - name: Upload coverage to codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v2.0.1
       with:
         verbose: true