git: openjdk/jdk-sandbox: json: RE -> ISE for illegal escape

[duke]

Changeset: e827a3b7
Branch: json
Author:    Naoto Sato <naoto.sato at oracle.com>
Date:      2025-02-03 15:02:06 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/e827a3b7804525a5bd414e7e5c33cfb6d11eeb7c

RE -> ISE for illegal escape

! src/java.base/share/classes/java/util/json/JsonStringImpl.java
! test/jdk/java/util/json/TestJsonString.java