fix(security): update Traefik from v3.6.7 to v3.6.20

[andershermansen]

What is this PR about?

Update Traefik to latest 3.6.x version. From v3.6.7 to v3.6.20

Addresses 20 CVEs in Traefik:
v3.6.8: CVE-2026-25949, CVE-2025-68121
v3.6.9: CVE-2026-26998, CVE-2026-26999, CVE-2026-29054
v3.6.10: CVE-2026-29777, CVE-2026-27141
v3.6.11: CVE-2026-32595, CVE-2026-32305, CVE-2026-32695
v3.6.12: CVE-2026-33433, CVE-2026-33186
v3.6.14: CVE-2026-40912, CVE-2026-39858, CVE-2026-35051, CVE-2026-41263, CVE-2026-41174
v3.6.15: CVE-2026-41181
v3.6.17: CVE-2026-44774
v3.6.19: CVE-2026-48020

Checklist

Before submitting this PR, please make sure that:

• You created a dedicated branch based on the canary branch.
• You have read the suggestions in the CONTRIBUTING.md file https://github.com/Dokploy/dokploy/blob/canary/CONTRIBUTING.md#pull-request
• You have tested this PR in your local instance. If you have not tested it yet, please do so before submitting. This helps avoid wasting maintainers' time reviewing code that has not been verified by you.

[agentHits]

@Siumauricio Why are you preventing project security?
I've already done enough PR, but you haven't even checked a single one.

I've noticed that you're taking a long time to update the project. Could you hire more people or give them more permissions to develop and improve it faster? At least in the areas of security and library updates, so that you could look at that first, then look at the bugs, and only then improve the project.

What I see now is that the project has stalled. There are many open issues and solutions, and they're not moving forward. Maybe you could solve something?

[agentHits]

@Siumauricio https://github.com/Dokploy/dokploy/pulls?q=is%3Apr+is%3Aopen+security Please look at and resolve all of these first and foremost - this is security, it should be the basis!