RFR: samples fixes for JDK 21 panama API changes and version change.

Tue Jul 25 10:32:02 UTC 2023

On Tue, 25 Jul 2023 03:21:57 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> All samples fine on MacOS. I changed run_windows scripts but I've not tested samples on Windows.

Marked as reviewed by mcimadamore (Committer).

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PR Review: https://git.openjdk.org/jextract/pull/126#pullrequestreview-1545144589