[Snyk] Security upgrade python from 3.9 to 3.13.11

[trongthanht3]

Snyk has created this PR to fix 1 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• docker/backend.dockerfile

We recommend upgrading to python:3.13.11, as this image has only 189 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Integer Overflow or Wraparound SNYK-DEBIAN13-IMAGEMAGICK-13615061	614
	Integer Overflow or Wraparound SNYK-DEBIAN13-IMAGEMAGICK-13615061	614
	Integer Overflow or Wraparound SNYK-DEBIAN13-IMAGEMAGICK-13615061	614
	Integer Overflow or Wraparound SNYK-DEBIAN13-IMAGEMAGICK-13615061	614
	Integer Overflow or Wraparound SNYK-DEBIAN13-IMAGEMAGICK-13615061	614

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• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
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🦉 Integer Overflow or Wraparound

[Copilot]

Pull request overview

This PR upgrades the Python base image in the backend Docker container from Python 3.9 to 3.13.11 to address security vulnerabilities, specifically an Integer Overflow vulnerability in ImageMagick (SNYK-DEBIAN13-IMAGEMAGICK-13615061). The upgrade is part of an automated Snyk security fix.

Key Changes:

• Updates Python base image version from 3.9 to 3.13.11 in backend.dockerfile

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[Copilot]

The pyproject.toml file specifies Python version constraint as "^3.9" which allows Python 3.9.x through 3.x (but not 4.0). While Python 3.13 falls within this range, the major version jump from 3.9 to 3.13 introduces several breaking changes and new features that may affect compatibility with dependencies. Consider updating the pyproject.toml Python version constraint to reflect the minimum supported version after this upgrade (e.g., "^3.13" if dropping support for older versions, or testing to ensure all dependencies work with both 3.9 and 3.13).

Suggested change

	FROM python:3.13.11
	FROM python:3.9