<i18n dev> RFR: 8348328: Update IANA Language Subtag Registry to Version 2025-05-15

[Justin Lu]

Please review this PR which updates the language subtag registry to Version 2025-05-15.

LanguageSubtagRegistryTest.java was updated with the preferred-values: `hnm`, `eko`, `luh`,`sjc`, `sqm`. A small change was also made to the test to improve the output as well.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/25503/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25503&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348328
  Stats: 143 lines in 2 files changed: 135 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/25503.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25503/head:pull/25503

PR: https://git.openjdk.org/jdk/pull/25503