RFR: JDK-8319413: Start of release updates for JDK 23 [v4]

[Alan Bateman]

On Thu, 30 Nov 2023 23:49:24 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Time to start making preparations for JDK 23.
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update symbol files to JDK 22 b26.

Good good. I assume you'll bump the copyright header on the files that need it before integration, e.g. JavacTestingAbstractProcessor.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16505#pullrequestreview-1759306298