Upgrade imapsync build dependencies and base image (tracking issue)

[stephdl]

Why

This issue tracks the upgrade of various build dependencies and the base Alpine image for NethServer/ns8-imapsync.
Upgrading is required to ensure security, maintainability, and compatibility with newer standards. All referenced upgrades are already merged and provide details for follow-up.

Purpose

Keep imapsync up-to-date by tracking upgrades to key dependencies and the base container image.

Proposed upgrades

Build dependencies

• Node.js upgrade: chore(deps): update node.js to v24
• axios security & feature upgrade: fix(deps): update dependency axios to ^0.30.0 [security]

Base image (Alpine version)

• Alpine upgrade: chore(deps): update alpine docker tag to v3.22.2

Each referenced PR contains implementation notes and vulnerability analysis where needed.

Alternative solutions

• Evaluate only mandatory security fixes if stability is impacted.
• Pause upgrades pending downstream compatibility assessment.

Additional context

• Upgrade PRs are merged and tested.
• Further integration tests will be performed as needed on imapsync releases.
• See referenced PRs for details/changelogs.

[stephdl]

QA

target 1.2.0-dev.1

test imapsync is workable to fetch email between two imap server
test the UI is fully workable
the test are workable for the direct installation, upgrade should be tested

[mrmarkuz]

Test case "Upgrade" verified