chore: bump DRAWIO_VERSION from 30.3.6 to 30.3.13

[github-actions]

The Dockerfile is pinned to DRAWIO_VERSION=30.3.6, but jgraph/drawio-desktop has a newer release available.

Current version: 30.3.6
Latest version: 30.3.13
Upstream release: https://github.com/jgraph/drawio-desktop/releases/tag/v30.3.13
Dockerfile source: https://github.com/jgraph/drawio-desktop/releases

Update the Dockerfile version arg if the new upstream release is compatible.

---

dependency: jgraph/drawio-desktop
arg: DRAWIO_VERSION
from: 30.3.6
to: 30.3.13