Update Container Version(s)

[www-signal-fyi]

Updating:
python:3.7-buster

[codara-ai-code-review]

Potential issues, bugs, or flaws:

1. /Dockerfile
   • The Dockerfile change to specify the Python base image with a specific digest is a good practice for reproducibility and stability, but it's important to ensure that this digest is regularly updated as needed for security patches and updates.

Suggestions, improvements, etc.:

1. /Dockerfile
   • Consider using a multi-stage build in the Dockerfile to reduce the final image size, especially if the development dependencies are not required in the production image.