Set fixed 10 min interval to update news items (uplift to 1.71.x) (#26358)

Uplift of #26336 (squashed) to release

Author: brave-builds

components/common/useRelativeTime.ts

@@ -31,7 +31,7 @@ export const getRelativeTime = (time: Date | number) => {
     const amount = Math.floor(diff / duration)
     return {
         formatted: rtf.format(amount, unit ),
-        updatesIn: duration - (Math.abs(diff - amount)),
+        updatesIn: 10 * minute,
     }
 }