Update Dockerfile base images

[pamella]

Description

• Update backend dockerfile base image
  • 
  • https://snyk.io/advisor/docker/python/3.12.3-slim

Motivation and Context

Address Snyk report.

Screenshots (if appropriate):

Steps to reproduce (if appropriate):

• Make sure the project is running properly with docker.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires documentation updates.
• I have updated the documentation accordingly.
• My change requires dependencies updates.
• I have updated the dependencies accordingly.

[pamella]

Closing because they are actually the same. Source: https://hub.docker.com/_/python