RFR: 8269597: Change JavaFX release version to 18

Tue Jul 6 17:02:49 UTC 2021

On Tue, 29 Jun 2021 14:21:27 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Bump the version number of JavaFX to 18. I will integrate this immediately after forking the `jfx17` stabilization branch, which is scheduled for Thursday, July 8, 2021 at 16:00 UTC.
> 
> ~~Leaving it as `Draft` for now. I'll make it `rfr` next week.~~

Marked as reviewed by pbansal (Committer).

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PR: https://git.openjdk.java.net/jfx/pull/554