RFR: 8299681: Change JavaFX release version to 21

[Ambarish Rapte]

On Tue, 10 Jan 2023 00:37:24 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Bump the version number of JavaFX to 21. I will integrate this to `master` as part of forking the `jfx20` stabilization branch, which is scheduled for Thursday, January 12, 2023 at 16:00 UTC.

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.org/jfx/pull/990