Increase contrast between UTC label and input

Increase contrast between the UTC label and the input inside
the data time picker.

app/assets/javascripts/vue_shared/components/date_time_picker/date_time_picker.vue

@@ -221,7 +221,9 @@ export default {
     >
       <template #button-content>
         <span class="gl-flex-grow-1 text-truncate">{{ timeWindowText }}</span>
-        <span v-if="utc" class="text-muted gl-font-weight-bold gl-font-sm">{{ __('UTC') }}</span>
+        <span v-if="utc" class="gl-text-gray-500 gl-font-weight-bold gl-font-sm">{{
+          __('UTC')
+        }}</span>
         <gl-icon class="gl-dropdown-caret" name="chevron-down" aria-hidden="true" />
       </template>
 

changelogs/unreleased/219638-date-picked-utc-label-color.yml

+---
+title: Increase contrast between UTC label and input
+merge_request: 34998
+author:
+type: changed