RFR: 8123: Use StandardCharsets where possible [v2]

[Marcus Hirt]

On Sat, 7 Oct 2023 11:40:11 GMT, Christoph Dreis <duke at openjdk.org> wrote:

>> Hi,
>> 
>> this PR replaces `UTF-8` String usages with `StandardCharsets.UTF_8` where possible.
>> 
>> I'd appreciate if this is sponsored including a ticket etc.
>> 
>> Cheers,
>> Christoph
>
> Christoph Dreis has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8123: Fix copyright dates

Marked as reviewed by hirt (Lead).

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PR Review: https://git.openjdk.org/jmc/pull/518#pullrequestreview-1663119360