Revert "Make debian-bullseye job non-voting"

This reverts commit a4680766515ed9317b71cfb39cd0d75dc04f3d9c.

Reason for revert: Debian job got repaired

Change-Id: I3ef969f6e373de103d26c9282cab94cea7ae87e5
diff --git a/.zuul.yaml b/.zuul.yaml
index 1923444..6dbb5ba 100644
--- a/.zuul.yaml
+++ b/.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