RFR: 8279615: Change JavaFX release version to 19

[Johan Vos]

On Fri, 7 Jan 2022 12:55:33 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Bump the version number of JavaFX to 19. I will integrate this immediately after forking the `jfx18` stabilization branch, which is scheduled for Thursday, January 13, 2022 at 16:00 UTC.

ok (once 18 is branched)

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Marked as reviewed by jvos (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/707