[jdk13u-dev] RFR: 8254982: (tz) Upgrade time-zone data to tzdata2020c

[Yuri Nesterenko]

It is time to backport tzdata2020c here, too. The patch applies without any adjustment. All relevant tests pass.

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Commit messages:
 - Backport 55a0cad82751940076aa56e7644fb812d6cad3ba

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/45/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=45&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254982
  Stats: 33 lines in 4 files changed: 30 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/45.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/45/head:pull/45

PR: https://git.openjdk.java.net/jdk13u-dev/pull/45