Upgrade Docker setup to Python 3.13

[Thejas1906]

Description

This PR updates the Docker environment for GPT Engineer to use Python 3.13, enabling compatibility with the latest Python version.

Changes include

• Updated base images in the Dockerfile from python:3.11-slim → python:3.13-slim.
• Adjusted Python library paths to match Python 3.13.
• Ensured all dependencies (openai>=1.0.0, backoff) remain installed and functional.
• Maintained existing multi-stage Docker setup and entrypoint configuration.

Motivation

• Support Python 3.13 for users who run GPT Engineer on the latest Python versions.
• Showcase GPT Engineer on YouTube using Python 3.13.

Impact

• No functional changes to the application.
• Existing projects and workflow remain compatible.

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[!IMPORTANT] Upgrade Docker setup to Python 3.13, updating base images, paths, and error handling.

• Docker Setup:
  • Update Dockerfile to use python:3.13-slim for both builder and final stages.
  • Adjust Python library paths to /usr/local/lib/python3.13/site-packages.
  • Ensure dependencies openai>=1.0.0 and backoff are installed.
• docker-compose:
  • Update docker-compose.yml to version 3.9.
• Entrypoint Script:
  • Add set -e in entrypoint.sh for immediate exit on errors.
  • Adjust file permissions handling in entrypoint.sh.

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