RFR: 7903928: update build.gradle to use JDK 23 [v3]

[Nizar Benalla]

On Wed, 22 Jan 2025 11:33:26 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
>
> Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:
> 
>   nit
>   
>   Co-authored-by: Chen Liang <liach at openjdk.org>

Thanks for the review Sundar, I committed a trivial change after it.

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PR Comment: https://git.openjdk.org/jextract/pull/275#issuecomment-2607036573