[automerger skipped] DO NOT MERGE Update Android TZDB from 2020f to 2021a. [R] am: 1cc4fe84a0 -s ours am: 64bd9b6232 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/timezone/+/13996968

Change-Id: I26954179a01d77855589f91609fe17e28f1a301f