RFR: 7904048: Update jtreg to use Ant 1.10.15 [v3]

[Iris Clark]

On Wed, 25 Jun 2025 16:24:58 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this update to make jtreg use Ant 1.10.15
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyright year
>   
>   [skip ci]

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jtreg/pull/270#pullrequestreview-2958920850