RFR: 7904129: Update jtreg to bundle JUnit 5.14.2

[Jaikiran Pai]

On Wed, 7 Jan 2026 15:54:41 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review this change updating the JUnit version to [5.14.2](https://docs.junit.org/5.14.2/release-notes.html).

This looks OK to me.

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Marked as reviewed by jpai (Reviewer).

PR Review: https://git.openjdk.org/jtreg/pull/306#pullrequestreview-3637341800