Revert "Make debian-bullseye job non-voting"

This reverts commit a468076.

Reason for revert: Debian job got repaired

Change-Id: I3ef969f6e373de103d26c9282cab94cea7ae87e5

Author: osfrickler

.zuul.yaml

@@ -674,8 +674,6 @@
     description: Debian Bullseye platform test
     nodeset: devstack-single-node-debian-bullseye
     timeout: 9000
-    # TODO(danms) n-v until the known issue is resolved
-    voting: false
     vars:
       configure_swap_size: 4096