chore(deps): bump debian

Bumps debian from bullseye-20230502-slim to bullseye-20231218-slim.

---
updated-dependencies:
- dependency-name: debian
  dependency-type: direct:production
...

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

Dockerfile.deb

@@ -1,5 +1,5 @@
 # When you update this file substantially, please update build_your_own_images.md as well.
-FROM debian:bullseye-20230502-slim
+FROM debian:bullseye-20231218-slim
 
 LABEL maintainer="Kong Docker Maintainers <docker@konghq.com> (@team-gateway-bot)"
 ARG KONG_VERSION=3.5.0