fix typo

Author: ssjunnebo

.github/workflows/test-code.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest, pytest-cov
+        pip install pytest pytest-cov
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Install dataflow_transfer
       run: pip install -e .