Add plotly installation to Codecov workflow

Author: e-riveras

.github/workflows/codecov.yml

@@ -15,6 +15,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install pytest pytest-cov
+          pip install plotly
 
       - name: Run tests and generate coverage
         run: pytest --cov=. --cov-report=xml