RFR: 8123: Use StandardCharsets where possible [v2]

[Christoph Dreis]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jmc/pull/518/files
  - new: https://git.openjdk.org/jmc/pull/518/files/1f7a9a8b..80888b92

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=518&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=518&range=00-01

  Stats: 7 lines in 7 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jmc/pull/518.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/518/head:pull/518

PR: https://git.openjdk.org/jmc/pull/518