circleci: Remove EOL'd debian:bullseye

And drop 32bit coverage that recently broke altogether and a little out
of the blue.

.circleci/config.yml

@@ -203,7 +203,7 @@ jobs:
         description: the Linux distribution (debian|ubuntu)
         type: string
       release:
-        description: the release name (bullseye|bookworm|focal|jammy|noble)
+        description: the release name (bookworm|focal|jammy|noble)
         type: string
       make_target:
         description: the make target to execute during the build
@@ -385,12 +385,6 @@ workflows:
           dist: fedora
           release: latest
           make_target: witness.dot
-      # oldest debian goes 32bit
-      - build:
-          name: build_debian_bullseye
-          dist: debian
-          release: bullseye
-          prefix: i386/
       - build:
           name: build_debian_bookworm
           dist: debian
@@ -437,7 +431,6 @@ workflows:
                 - ubuntu:focal
                 - ubuntu:jammy
                 - ubuntu:noble
-                - debian:bullseye
                 - debian:bookworm
                 - almalinux:8
                 - almalinux:9