Install apt dependencies using bookworm source, consistent with base image. Remove unnecessary, error-prone pins

[deephbz]

Summary

This fixes libldap and libmagic dependency issue which is breaking main branch CICD build and causing run-time errors for users.

Explanation

Current api/Dockerfile pinned a small subset (e.g. libldap) of dependencies to very specific versions but not the rest of packages. This causes version conflict troubles when other 3rd-party packages get updated.

Using bookworm as base Docker image but using testing debian package source makes the situation worse.

As a result, the api docker image build encounters error and breaks CI.

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[laipz8200]

Thank you for your contribution! I’ll test this PR later.

According to our contribution guide, each pull request should be linked to an issue. I’ll link this one to #13181.

[deephbz]

Thank you for your contribution! I’ll test this PR later.

According to our contribution guide, each pull request should be linked to an issue. I’ll link this one to #13181.

Thanks. I've tested it locally by cd api && docker buildx build and then use that image in local docker-compose stack without issue. Let me know if there's a problem.