🐳 Bump ubuntu in /ros2/nightly/nightly (#847)

Bumps ubuntu from noble-20250910 to noble-20250925.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-version: noble-20250925
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

ros2/nightly/nightly/Dockerfile

@@ -1,5 +1,5 @@
 # multi-stage for setup
-FROM ubuntu:noble-20250910 AS setuper
+FROM ubuntu:noble-20250925 AS setuper
 ARG DEBIAN_FRONTEND=noninteractive
 
 # setup timezone