Update debian Docker tag to v13

| datasource | package | from | to |
| ---------- | ------- | ---- | -- |
| docker     | debian  | 12   | 13 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build/Dockerfile

@@ -280,7 +280,7 @@ RUN --mount=type=bind,from=alpine-fips-3.22,target=/tmp/fips/ \
 
 
 ############################################# Base image for Debian with NGINX Plus only #############################################
-FROM debian:12-slim@sha256:b4aa902587c2e61ce789849cb54c332b0400fe27b1ee33af4669e1f7e7c3e22f AS debian-plus-only
+FROM debian:13-slim@sha256:e711a7b30ec1261130d0a121050b4ed81d7fb28aeabcf4ea0c7876d4e9f5aca2 AS debian-plus-only
 ARG NGINX_PLUS_VERSION
 
 ENV NGINX_VERSION=${NGINX_PLUS_VERSION}