Integrated: Update jextract/panama branch to track JDK 22

[Maurizio Cimadamore]

On Thu, 15 Jun 2023 09:47:30 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR contains some initial changes to enable jextract support for the latest Panama repo (and JDK 22 in general).
> 
> It contains the usual updates to source, build and readme files (e.g. to replace jdk21 with jdk22).
> 
> On top of that there are some changes to support the latest API changes in the Panama repo such as:
> * removal of implicit sequence layout factory
> * renaming of XYZUtf8String -> XYZString

This pull request has now been integrated.

Changeset: ca8942c3
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/jextract/commit/ca8942c38894040e76edf77a111ad7cd5f06052f
Stats:     39 lines in 19 files changed: 1 ins; 0 del; 38 mod

Update jextract/panama branch to track JDK 22

Reviewed-by: jvernee

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PR: https://git.openjdk.org/jextract/pull/123