Using python3 instead of python in workflow

Author: Victor Machado

.github/workflows/test-credentials.yml

@@ -20,7 +20,7 @@ jobs:
 
       - name: Create and activate virtual environment
         run: |
-          python -m venv .venv
+          python3 -m venv .venv
           source .venv/bin/activate
 
       - name: Install froster locally