Fix invalid Python dev container image tag

## Description

The current dev container configuration uses an invalid image tag that doesn't exist:

```sh
mcr.microsoft.com/devcontainers/python:0-3.12
```

## Problem

When trying to open this repository in a dev container, it fails because the image tag 0-3.12 is not valid. Microsoft's official Python dev container images use 1- prefix, not 0-.

ref. https://mcr.microsoft.com/v2/devcontainers/python/tags/list

## Proposed Solution

Update the image tag in `devcontainer.json` to one of the following:

- `mcr.microsoft.com/devcontainers/python:1-3.12`
- `mcr.microsoft.com/devcontainers/python:3.12`