Update Container Version(s)

[www-signal-fyi]

Updating:
python:3.7

[codara-ai-code-review]

Potential issues, bugs, or flaws:

1. /app/Dockerfile:1
   • The Dockerfile FROM directive should not include a specific image digest (@sha256:...). Using a specific digest is not recommended as it can make your image less flexible and harder to update. It's better to pin the image to a specific tag instead, such as python:3.7, to ensure reproducibility without sacrificing flexibility. Consider reverting to just FROM python:3.7.