git: openjdk/jdk16u: 8260010: UTF8ZipCoder not thread-safe since JDK-8243469

[Claes Redestad]

Changeset: 834962bc
Author:    Claes Redestad <redestad at openjdk.org>
Date:      2021-01-25 15:27:35 +0000
URL:       https://git.openjdk.java.net/jdk16u/commit/834962bc

8260010: UTF8ZipCoder not thread-safe since JDK-8243469

Backport-of: 1f47de5f6a3969ab2bdd1330ffbb4a9a572f7074

! src/java.base/share/classes/java/util/zip/ZipCoder.java