<i18n dev> RFR: 8284842: Update Unicode Data Files to Version 15.0.0

[Naoto Sato]

Updates the JDK to use the latest Unicode 15, which also updates the ICU4J along with it (8284844: Update ICU4J to Version 72.1). The corresponding CSR has already been approved.

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Commit messages:
 - 8284842: Update Unicode Data Files to Version 15.0.0

Changes: https://git.openjdk.org/jdk/pull/10839/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10839&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284842
  Stats: 1125 lines in 29 files changed: 821 ins; 33 del; 271 mod
  Patch: https://git.openjdk.org/jdk/pull/10839.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10839/head:pull/10839

PR: https://git.openjdk.org/jdk/pull/10839