Describe the issue:
After running azd up, the API endpoint fails to load in the browser and returns a 503 Service Unavailable error. Checking the logs on the Azure portal reveals a missing six module, as shown in the image below:

In addition, this issue can also be reproduced in todo-python-mongo-aca and todo-python-mongo-terraform.

Repro Steps:

1. Run azd init -t todo-python-mongo -b staging.
2. Run azd up
3. Click the api url in the log.

Environment:

• Template: todo-python-mongo, todo-python-mongo-aca, todo-python-mongo-terraform.
• OS: Windows
• Branch: Staging
• Azd version: azd version 1.21.0-beta.1-daily.5505216 (commit 73b7edcbf0da38b170d635f250043e7d4213e65e).

Expected behavior:
The api page can be loaded successfully.

Suggestion:
Add six == 1.17.0 to src/api/requirements.txt.

@rajeshkamal5050 for notification.