Update Container Version(s)

[www-signal-fyi]

Updating:
python:3.7-buster

[codara-ai-code-review]

Code Suggestions/Improvements

1. /Dockerfile
   • Consider pinning the versions of the Python dependencies installed in the Docker image, to ensure reproducibility and avoid unexpected issues due to dependency updates.

Potential issues, bugs, or flaws:

1. /Dockerfile
   • The change in the FROM instruction to include a specific image digest is a good practice for reproducibility, but it's important to ensure that this digest is regularly updated when the base image is updated, to benefit from security patches and updates. Ensure that updating the image digest is included in the regular maintenance tasks.