support/docker: move to current bookworm (Debian 12) snapshot

Debian 11 is out of security support since 15 August 2024, so move to
current Debian 12 instead.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/docker/Dockerfile

@@ -6,7 +6,7 @@
 # We use a specific tag for the base image *and* the corresponding date
 # for the repository., so do not forget to update the apt-sources.list
 # file that is shipped next to this Dockerfile.
-FROM debian:bullseye-20230202
+FROM debian:bookworm-20250203
 
 LABEL maintainer="Buildroot mailing list <buildroot@buildroot.org>" \
       vendor="Buildroot" \

support/docker/apt-sources.list

@@ -1,4 +1,4 @@
-# Latest just before 20230207T102800Z:
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20230206T092119Z/ bullseye main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20230206T092119Z/ bullseye-security main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20230206T092119Z/ bullseye-updates main
+# Latest just before 20250205151400Z:
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250205T145632Z/ bookworm main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20250205T145632Z/ bookworm-security main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250205T145632Z/ bookworm-updates main