deb: Drop Debian 11 Bullseye support

deb/Makefile

@@ -53,9 +53,9 @@ RUN?=docker run --rm \
 	$(RUN_FLAGS) \
 	debbuild-$@/$(ARCH)
 
-DEBIAN_VERSIONS ?= debian-bullseye debian-bookworm debian-trixie
+DEBIAN_VERSIONS ?= debian-bookworm debian-trixie
 UBUNTU_VERSIONS ?= ubuntu-jammy ubuntu-noble ubuntu-resolute
-RASPBIAN_VERSIONS ?= raspbian-bullseye raspbian-bookworm
+RASPBIAN_VERSIONS ?= raspbian-bookworm
 DISTROS := $(DEBIAN_VERSIONS) $(UBUNTU_VERSIONS) $(RASPBIAN_VERSIONS)
 
 .PHONY: help

deb/build-deb

@@ -57,10 +57,10 @@ pkgRevision=1
 #   packaging-only changes (without a corresponding release of the software
 #   that's packaged).
 # - distro (e.g., "ubuntu")
-# - VERSION_ID (e.g. "22.04" or "11") this must be "sortable" to make sure that
+# - VERSION_ID (e.g. "22.04" or "12") this must be "sortable" to make sure that
 #   packages are upgraded when upgrading to a newer distro version ("codename"
 #   cannot be used for this, as they're not sorted)
-# - SUITE ("codename"), e.g. "jammy" or "bullseye". This is mostly for convenience,
+# - SUITE ("codename"), e.g. "jammy" or "bookworm". This is mostly for convenience,
 #   because some places refer to distro versions by codename, others by version.
 #   we prefix the codename with a tilde (~), which effectively excludes it from
 #   version comparison.

distros.json

@@ -17,15 +17,6 @@
         "description": "CentOS Stream 10",
         "end_of_life": "2030"
     },
-    "debian-bullseye": {
-        "image": "debian:bullseye",
-        "arches": [
-            "amd64",
-            "aarch64",
-            "armhf"
-        ],
-        "description": "Debian 11 (oldstable)"
-    },
     "debian-bookworm": {
         "image": "debian:bookworm",
         "arches": [