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 exact image digest (using the @sha256 suffix) is generally a good practice for ensuring reproducibility and consistency. However, it's important to be aware that using the image digest manually means that the base image will no longer be automatically updated when a new version is released. This trade-off should be considered carefully.

Suggestions, improvements, etc.:

1. /Dockerfile
   • Consider using a multi-stage build in the Dockerfile to optimize the final image size, especially if the development dependencies are no longer needed in the production image.