RFR: 8327225: Revert DataInputStream.readUTF to static final

[Roger Riggs]

On Mon, 4 Mar 2024 13:55:15 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> [JDK-8325340](https://bugs.openjdk.org/browse/JDK-8325340) accidentally removed `final` from the `static final DataInputStream.readUTF` method. This has a minor compatibility impact (allows hiding the method in a subclass, while before that would throw an exception at compile time) and since it was not the intent of the prior change to alter any behavioral semantics here I want to revert that change.

Good catch; it would have been caught by the signature tests but later.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18107#pullrequestreview-1914625661