Prefer JDK's StandardCharsets

[elharo]

Description

Replace internal UTF-8 constant with JDK StandardCharsets.UTF_8

Motivation and Context

Modernization. This hasn't been needed since Java 6.

Impact

StringUtils.UTF_8 is deleted.

Test Plan

CI

Contributor checklist

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• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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Release Notes

== NO RELEASE NOTES ==

[steveburnett]

Suggest revising the release note entry following the release notes guidelines. Maybe like this:

== RELEASE NOTES ==

General Changes
* Replace StringUtils.UTF_8 with StandardCharsets.UTF_8 :pr:`22677`

[elharo]

Replace StringUtils.UTF_8 with StandardCharsets.UTF_8 :pr:22677

is the implementation change. The public API change is that StringUtils.UTF_8 is defunct.

[steveburnett]

Thanks for the clarification! Maybe you can find an accurate rephrasing that follows the Order of changes in the Release Notes Guidelines.

[edit to add] Nice work on the rephrasing, thanks!

[tdcmeehan]

There should be no user-visible change, so release note not necessary.

[elharo]

Could swear somewhere it said something about API changes, but in any case fixed. No more release notes here. PTAL