RFR: 8357081: Removed unused methods of HexDigits [v2]

[Shaojin Wen]

> In HexDigits, getCharsLatin1 and getCharsUTF16 are no longer used, so remove these methods

Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge remote-tracking branch 'upstream/master' into hexdigits_202505
   
   # Conflicts:
   #	src/java.base/share/classes/jdk/internal/util/HexDigits.java
 - remove unused code

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Changes: https://git.openjdk.org/jdk/pull/25258/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25258&range=01
  Stats: 69 lines in 1 file changed: 0 ins; 69 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25258.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25258/head:pull/25258

PR: https://git.openjdk.org/jdk/pull/25258