RFR: 8353453: URLDecoder should use HexFormat

[Jaikiran Pai]

On Sat, 29 Mar 2025 17:27:20 GMT, Patrick Strawderman <duke at openjdk.org> wrote:

> Use `HexFormat.fromHexDigits` in URLDecoder, instead of `Integer.parseInt`.

I would have preferred for the catch block to be changed to catch `IllegalArgumentException` instead of the current `NumberFormatException`, to closely align with the specification of `HexFormat.fromHexDigits(CharSequence string, int fromIndex, int toIndex)`, but I see that it has been discussed and the current version approved. 

Looks OK to me.

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Marked as reviewed by jpai (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24314#pullrequestreview-2745751948