Re-enable the stable rocky job

stable rocky is fixed and green now[1],
This commit re-enables those.

[1] https://review.opendev.org/#/q/topic:fix-stable-gate+(status:open+OR+status:merged)

Change-Id: Ia25c8022f6bf2a0015641ef097f09b29f34e6d16
diff --git a/.zuul.yaml b/.zuul.yaml
index 23b5a00..02570a6 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -642,7 +642,6 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-rocky-py3:
             irrelevant-files: *tempest-irrelevant-files
-            voting: false
         - tempest-multinode-full-py3:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-tox-plugin-sanity-check: