[Snyk] Security upgrade php from 8.2-fpm-alpine to 8.4.7RC1-fpm-alpine

[fiddike]

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):

• backend/docker/php-fpm/Dockerfile

We recommend upgrading to php:8.4.7RC1-fpm-alpine, as this image has only 0 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-2025-29087 SNYK-ALPINE321-SQLITE-9712340	686
	Use After Free SNYK-ALPINE321-CARES-9680227	364
	Race Condition SNYK-ALPINE321-XZ-9666601	364
	Race Condition SNYK-ALPINE321-XZ-9666601	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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