[automerger skipped] DO NOT MERGE Track tzdb 2021a3 updates. [O-MR1-CTS] am: 98bd5fce31 -s ours am: 3a246c55e6 -s ours am: 53daa15f9a -s ours am: 200e521645 -s ours am: 1b9c07d3f3 -s ours am: 1b7278ace1 -s ours am: 777f7491e3 -s ours am: 61bf1594ab -s ours

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Original change: https://android-review.googlesource.com/c/platform/external/icu/+/1903515

Change-Id: I1925ed5111e129d1b4e04ff694040573a29dc275