[jdk15u-dev] Integrated: 8274407: (tz) Update Timezone Data to 2021c

[Yuri Nesterenko]

A necessary update for every release. Applies cleanly. Some 101 relevant tests all pass.

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Commit messages:
 - Backport 8ca084617f331b6af934179f3f776c8158da5bba

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/122/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=122&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274407
  Stats: 635 lines in 13 files changed: 228 ins; 329 del; 78 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/122.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/122/head:pull/122

PR: https://git.openjdk.java.net/jdk15u-dev/pull/122