Bug 1503547 - Move searchfox indexing jobs a half hour earlier to match nightly build times. r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D10557

--HG--
extra : moz-landing-system : lando

.cron.yml

@@ -87,7 +87,7 @@ jobs:
           - mozilla-central
       when:
           by-project:
-              mozilla-central: [{hour: 10, minute: 30}]
+              mozilla-central: [{hour: 10, minute: 0}]
               # No default
 
     - name: bouncer-check