chore(deps): bump debian in /dockerfiles/sidekick

Bumps debian from trixie-20251020 to trixie-20251103.

---
updated-dependencies:
- dependency-name: debian
  dependency-version: trixie-20251103
  dependency-type: direct:production
...

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

Author: dependabot[bot]

dockerfiles/sidekick/Dockerfile

@@ -1,7 +1,7 @@
 # This Dockerfile is used to prepare a Debian-based Docker image with several utilities installed.
 
 # We start from the Debian 'trixie' image.
-FROM debian:trixie-20251020 as prepare-stage
+FROM debian:trixie-20251103 as prepare-stage
 
 # Copy all shell scripts from the current directory to /usr/local/bin/ in the image.
 COPY *sh /usr/local/bin/