github: require quincy job to pass in mergify config

After adding the reef job, it was noticed that there was no quincy job.
Apparently we (probably me) forgot to add it at the time we added quincy
to our CI matrix, so we're adding it now.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

.github/mergify.yml

@@ -18,6 +18,7 @@ queue_rules:
       - check-success=test-suite (nautilus)
       - check-success=test-suite (octopus)
       - check-success=test-suite (pacific)
+      - check-success=test-suite (quincy)
       - check-success=test-suite (reef)
 
 pull_request_rules:
@@ -42,6 +43,7 @@ pull_request_rules:
       - status-success=test-suite (nautilus)
       - status-success=test-suite (octopus)
       - status-success=test-suite (pacific)
+      - status-success=test-suite (quincy)
       - status-success=test-suite (reef)
       - or:
         - and: