git: openjdk/jdk: 8300866: Declare some classes final in java.io

[Per Minborg]

Changeset: d1173508
Author:    Per Minborg <pminborg at openjdk.org>
Date:      2023-01-23 19:09:39 +0000
URL:       https://git.openjdk.org/jdk/commit/d11735087507a17204bd81ae565409a3b7e881ae

8300866: Declare some classes final in java.io

Reviewed-by: alanb

! src/java.base/share/classes/java/io/ExpiringCache.java
! src/java.base/share/classes/java/io/ObjectInputStream.java
! src/java.base/share/classes/java/io/ObjectOutputStream.java
! src/java.base/share/classes/java/io/ObjectStreamClass.java
! src/java.base/share/classes/java/io/ProxyingConsole.java