[Snyk] Security upgrade python from 3.9-slim to 3.14.4-slim

[sestinj]

Snyk has created this PR to fix 3 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):

• manual-testing-sandbox/Dockerfile

We recommend upgrading to python:3.14.4-slim, as this image has only 36 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
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	614
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	614
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	614
	Unrestricted Upload of File with Dangerous Type SNYK-DEBIAN13-TAR-15962848	371
	CVE-2026-2219 SNYK-DEBIAN13-DPKG-15426448	364

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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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🦉 Unrestricted Upload of File with Dangerous Type

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Summary by cubic

Upgrade the manual-testing-sandbox base image from python:3.9-slim to python:3.14.4-slim to pull in current Debian security patches and reduce CVEs. Addresses vulnerabilities in base packages (OpenSSL, tar, dpkg); please verify the sandbox still builds and runs on Python 3.14.

• Migration
  • Rebuild the image (docker build -f manual-testing-sandbox/Dockerfile .).
  • Start the container and smoke test basic flows.

^{Written for commit 443232d. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

[continue]

Documentation Review

No documentation updates needed for this PR.

Reason: This change upgrades the Python base image in manual-testing-sandbox/Dockerfile from 3.9-slim to 3.14.4-slim for security fixes. This is an internal testing infrastructure file that:

• Is not referenced in any Continue documentation
• Does not affect user-facing features, APIs, or developer workflows
• Is purely an internal security maintenance change

The docs are scoped to help developers understand and use Continue—internal test sandbox configurations are outside that scope.