Jenkinsfile: update Debian EOL dates

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Jenkinsfile

@@ -5,8 +5,8 @@ def branch = env.CHANGE_TARGET ?: env.BRANCH_NAME
 def pkgs = [
     [target: "centos-9",                 image: "quay.io/centos/centos:stream9",          arches: ["amd64", "aarch64"]],
     [target: "centos-10",                image: "quay.io/centos/centos:stream10",         arches: ["amd64", "aarch64"]],          // CentOS Stream 10 (EOL: 2030)
-    [target: "debian-bullseye",          image: "debian:bullseye",                        arches: ["amd64", "aarch64", "armhf"]], // Debian 11 (stable)
-    [target: "debian-bookworm",          image: "debian:bookworm",                        arches: ["amd64", "aarch64", "armhf"]], // Debian 12 (Next stable)
+    [target: "debian-bullseye",          image: "debian:bullseye",                        arches: ["amd64", "aarch64", "armhf"]], // Debian 11 (oldstable, EOL: 2024-08-14, EOL (LTS): 2026-08-31)
+    [target: "debian-bookworm",          image: "debian:bookworm",                        arches: ["amd64", "aarch64", "armhf"]], // Debian 12 (stable, EOL: 2026-06-10, EOL (LTS): 2028-06-30)
     [target: "fedora-40",                image: "fedora:40",                              arches: ["amd64", "aarch64"]],          // EOL: May 13, 2025
     [target: "fedora-41",                image: "fedora:41",                              arches: ["amd64", "aarch64"]],          // EOL: November, 2025
     [target: "raspbian-bullseye",        image: "balenalib/rpi-raspbian:bullseye",        arches: ["armhf"]],                     // Debian/Raspbian 11 (stable)