git: openjdk/jdk21: 8309937: Add @sealedGraph for some Panama FFM interfaces

[Per Minborg]

Changeset: ef0357f6
Author:    Per Minborg <pminborg at openjdk.org>
Date:      2023-06-21 08:13:09 +0000
URL:       https://git.openjdk.org/jdk21/commit/ef0357f6cbb23f22a60266206f8937f1ad23d85c

8309937: Add @sealedGraph for some Panama FFM interfaces

Reviewed-by: mcimadamore
Backport-of: b412fc79c3c2548df10918090beedaf6b2d08d96

! src/java.base/share/classes/java/lang/foreign/GroupLayout.java