[Snyk] Security upgrade debian from 12.6 to 12.9

[Rose2161]

Snyk has created this PR to fix 5 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):

• content/engine/security/https/Dockerfile

We recommend upgrading to debian:12.9, as this image has only 35 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
	Algorithmic Complexity SNYK-DEBIAN12-GNUTLS28-8705121	586
	Algorithmic Complexity SNYK-DEBIAN12-LIBTASN16-8689970	586
	Integer Overflow or Wraparound SNYK-DEBIAN12-ZLIB-6008963	500
	CVE-2025-1390 SNYK-DEBIAN12-LIBCAP2-8732577	221
	Information Exposure SNYK-DEBIAN12-UTILLINUX-2401083	150

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Important

• 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.
• This PR was automatically created by Snyk using the credentials of a real user.

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[guardrails]

⚠️ We detected 1 security issue in this pull request:

Insecure Access Control (1)

Severity	Details	Docs
High	Title: Missing User Instruction docker.github.io/content/engine/security/https/Dockerfile Line 2 in f81f03e FROM debian:12.9	📚

More info on how to fix Insecure Access Control in Dockerfile.

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