RFR: 8362428: Update IANA Language Subtag Registry to Version 2025-08-25

[Justin Lu]

Routine update to IANA subtag registry data with [latest data](https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry). Version is bumped to 2025-08-25.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/28612/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28612&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362428
  Stats: 59 lines in 2 files changed: 53 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/28612.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28612/head:pull/28612

PR: https://git.openjdk.org/jdk/pull/28612