git: openjdk/jdk-sandbox: json: Drop 'conversion' wording in JAE msg

[duke]

Changeset: 7948c608
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-08-14 13:15:12 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/7948c6080fe17bcbb0072817fab526ebcd6545af

Drop 'conversion' wording in JAE msg

! src/java.base/share/classes/jdk/internal/util/json/Utils.java
! test/jdk/java/util/json/TestAssertion.java