Merge "Update Mongolia in countryzones.txt due to ICU 67 version upgrade" am: 0c5cbdcbb0 am: c6fd685ad0

Original change: https://android-review.googlesource.com/c/platform/system/timezone/+/1540174

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1a7444ebfda142f2fd6b49f11ad2fba06e0d2416