build(deps): bump nextcloud-releases/whiteboard

Bumps nextcloud-releases/whiteboard from v1.0.2 to v1.0.3.

---
updated-dependencies:
- dependency-name: nextcloud-releases/whiteboard
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Containers/whiteboard/Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:latest
-FROM ghcr.io/nextcloud-releases/whiteboard:v1.0.2
+FROM ghcr.io/nextcloud-releases/whiteboard:v1.0.3
 
 USER root
 RUN set -ex; \