RFR: 8336632: Update Gradle to 8.9

[Kevin Rushforth]

On Tue, 20 Aug 2024 02:59:00 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> Gradle 8.8 released on May 31, 2024, supports JDK 22.
> On Jul 11, 2024, gradle 8.9 was released too, so we can update to the latest gradle 8.9 
> 
> This gradle update is required in order to update the boot jdk to 22.0.2.
> The changes are minimal, no source code changes were required.
> 
> This PR also includes the boot jdk update.

Reviewers: @kevinrushforth @tiainen

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PR Comment: https://git.openjdk.org/jfx/pull/1539#issuecomment-2298668734