Bug 1590150 - Turn off ESR60 cron jobs. r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D49962

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

.cron.yml

@@ -164,9 +164,6 @@ jobs:
               mozilla-release:
                   - {hour: 7, minute: 0}
                   - {hour: 19, minute: 0}
-              mozilla-esr60:
-                  - {hour: 7, minute: 0}
-                  - {hour: 19, minute: 0}
 
     - name: periodic-update
       job:
@@ -177,7 +174,6 @@ jobs:
           - mozilla-central
           - mozilla-beta
           - mozilla-release
-          - mozilla-esr60
           - mozilla-esr68
       when:
           - {weekday: 'Monday', hour: 10, minute: 0}