RFR: 8359445: GHA: Update gradle wrapper-validation action to v4

[Marius Hanl]

On Fri, 13 Jun 2025 14:26:04 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> As noted in JBS, our GitHub Actions workflow uses `gradle/actions/wrapper-validation at v3`. We should update to the latest version, which is v4.
> 
> In addition to it being a good idea to use the latest, we've seen a lot of intermittent failures in gradle validation, and I hope this might help.

Looks good. I also hope it helps with intermittent validation failures (Got that at least >10 times in the last month).

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Marked as reviewed by mhanl (Committer).

PR Review: https://git.openjdk.org/jfx/pull/1826#pullrequestreview-2928192418