RFR: 7903928: update build.gradle to use JDK 23

[Chen Liang]

On Tue, 21 Jan 2025 18:53:33 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

> We've updated native makefile to use JDK 23 (https://github.com/openjdk/jextract/commit/0b89a462146940a2ec90e34eeb5df3d46d8980d2), build.gradle works & expects jdk 23, it still refers to JDK var as "jdk22_home" and passes --release to be 22. Also jextract version is "22".
> 
> The mismatch has caused [some confusion](https://mail.openjdk.org/pipermail/panama-dev/2025-January/020915.html).
> 
> This patch to rename references to `jdk22_home` to `jdk_home`, the jextract version has now been bumped to `23`.
> 
> This PR has been obtained through a `git merge --squash` of #271.
> 
> TIA

build.gradle line 63:

> 61: 
> 62: compileJava {
> 63:     options.release = 23

Same as above: with this set, users now must use JDK 23 or higher.

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PR Review Comment: https://git.openjdk.org/jextract/pull/275#discussion_r1924235323