git: openjdk/jdk-sandbox: json: optimize the key parsing

[duke]

Changeset: 2af420b4
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-01-14 14:28:15 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/2af420b41ece523b300c1e004eb2739f675bb826

optimize the key parsing

! src/java.base/share/classes/java/util/json/JsonParser.java
! src/java.base/share/classes/java/util/json/JsonStringImpl.java