RFR: 7904068: Update to use JUnit 5.13 [v2]

[Iris Clark]

On Thu, 28 Aug 2025 06:59:34 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change updating to use JUnit 5.13.4
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fail if JUnit could not find any test

Thanks!

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/apidiff/pull/30#pullrequestreview-3166933541