RFR: 8336632: Update Gradle to 8.9

[Kevin Rushforth]

On Tue, 20 Aug 2024 13:41:56 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> I would suggested in another PR to have a single constant with the Java version and not updated 12 places to the same version.

This is tracked by https://bugs.openjdk.org/browse/JDK-8255712

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PR Comment: https://git.openjdk.org/jfx/pull/1539#issuecomment-2299486307