RFR: 8126: Update to Eclipse 2023-09

[Christoph Langer]

On Sat, 14 Oct 2023 23:25:08 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> ...also fixing some checkstyle complaints.

Looks good. Shouldn't we add an Eclipse 2023-06 configuration for the sake of completeness, though?

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Marked as reviewed by clanger (Committer).

PR Review: https://git.openjdk.org/jmc/pull/525#pullrequestreview-1678768815