git: openjdk/jdk-sandbox: json: stricter wording regarding duplicate keys for all impls

[duke]

Changeset: aeaf006c
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-04-29 13:37:02 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/aeaf006c574709d688de2d7b39febb8bc75907bd

stricter wording regarding duplicate keys for all impls

! src/java.base/share/classes/java/util/json/JsonObject.java