Update debian:12-slim Docker digest to 78d2f66 (main) (#8448)

Update debian:12-slim Docker digest to 78d2f66

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

Author: renovate[bot]

build/Dockerfile

@@ -281,7 +281,7 @@ RUN --mount=type=bind,from=alpine-fips-3.19,target=/tmp/fips/ \
 
 
 ############################################# Base image for Debian with NGINX Plus only #############################################
-FROM debian:12-slim@sha256:7e490910eea2861b9664577a96b54ce68ea3e02ce7f51d89cb0103a6f9c386e0 AS debian-plus-only
+FROM debian:12-slim@sha256:78d2f66e0fec9e5a39fb2c72ea5e052b548df75602b5215ed01a17171529f706 AS debian-plus-only
 ARG NGINX_PLUS_VERSION
 
 ENV NGINX_VERSION=${NGINX_PLUS_VERSION}