git: openjdk/jdk-sandbox: json: package rename leftover

[duke]

Changeset: 4f20bf02
Branch: json
Author:    Naoto Sato <naoto.sato at oracle.com>
Date:      2025-01-09 12:59:04 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/4f20bf0214067390e51460826f7009e3cd53327a

package rename leftover

! make/test/BuildTestLib.gmk