image: switch to Debian 13 "Trixie"

NB: Angie repository for Debian 13 is coming soon.

apt/prefs.backports

@@ -1,27 +0,0 @@
-Package: src:curl
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:debhelper
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:elfutils
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:iproute2
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:libbpf
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:systemd
-Pin: release n=bookworm-backports
-Pin-Priority: 600
-
-Package: src:sysvinit
-Pin: release n=bookworm-backports
-Pin-Priority: 600

apt/sources.debian

@@ -1,11 +1,11 @@
 Types: deb
 URIs: http://deb.debian.org/debian
-Suites: bookworm bookworm-updates bookworm-proposed-updates bookworm-backports
+Suites: trixie trixie-updates trixie-proposed-updates trixie-backports
 Components: main
 Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
 
 Types: deb
 URIs: http://deb.debian.org/debian-security
-Suites: bookworm-security
+Suites: trixie-security
 Components: main
 Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg