[Snyk] Security upgrade python from 3.9 to 3.14.2

[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:3.14.2, as this image has only 185 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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[Copilot]

Pull request overview

This PR proposes a security upgrade to address ImageMagick vulnerabilities by updating the Python base Docker image from version 3.9 to 3.14.2 in the backend.dockerfile. However, there is a critical issue: Python 3.14.2 does not exist as a valid release. As of January 2025, the latest stable Python version is in the 3.13.x series.

Key Issues:

• Python 3.14.2 is not a valid Python version
• If this version is valid as of December 2025, it should be verified that the Docker image exists and is stable
• The pyproject.toml specifies python = "^3.9", which would be compatible with Python 3.13

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