Fix date-dependent snapshot test with useFakeDate

ee/spec/frontend/geo_replicable/components/geo_replicable_time_ago_spec.js

 import Vuex from 'vuex';
 import { createLocalVue, mount } from '@vue/test-utils';
+import { useFakeDate } from 'helpers/fake_date';
 import createStore from 'ee/geo_replicable/store';
 import GeoReplicableTimeAgo from 'ee/geo_replicable/components/geo_replicable_time_ago.vue';
 import TimeAgo from '~/vue_shared/components/time_ago_tooltip.vue';
@@ -34,6 +35,9 @@ describe('GeoReplicableTimeAgo', () => {
   const findDefaultText = () => findGeoReplicableTimeAgo().find('span');
 
   describe('template', () => {
+    // ensure consistent output for timeago
+    useFakeDate(2020, 0, 1);
+
     beforeEach(() => {
       createComponent();
     });