RFR: 8349664: HEX dump should always use ASCII or ISO_8859_1

[Sean Mullan]

On Mon, 17 Feb 2025 11:40:59 GMT, Mikhail Yankelevich <duke at openjdk.org> wrote:

> Changed `HexDumpEncoder`, so `encodeBuffer` always uses ISO_8859_1. 
> This also fixes the issue with conversion in `encode` method, as the input is always ISO_8859_1.

The fix needs a test or you need to add an appropriate `noreg` label to the JBS issue if it isn't necessary or practical for some reason.

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PR Comment: https://git.openjdk.org/jdk/pull/23661#issuecomment-2666874604