ci: only build package for bullseye (#72729)

Jenkinsfile

@@ -31,7 +31,7 @@ PGPORT=`python3 -c 'import struct; import socket; s=socket.socket(); s.setsockop
             steps {
                 script {
                     if (env.JOB_NAME == 'authentic2-cut' && env.GIT_BRANCH == 'origin/main') {
-                        sh 'sudo -H -u eobuilder /usr/local/bin/eobuilder -d buster,bullseye authentic2-cut'
+                        sh 'sudo -H -u eobuilder /usr/local/bin/eobuilder -d bullseye authentic2-cut'
                     }
                 }
             }