Update to Ubuntu 26.04 LTS "Resolute Raccoon"

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treewide: update to Ubuntu 26.04 LTS Resolute Raccoon 🦝

dependenciesPull requests that update a dependency filePull requests that update a dependency file

enhancement

State: waiting for PRThis PR is waiting for another PR to be merged.This PR is waiting for another PR to be merged.

Status: Draft (not ready).

RIOT-OS/riotdockernumber 286

#286 In RIOT-OS/riotdocker;

· crasbe opened on Aug 14, 2026