RFR: 8289835: Change JavaFX release version to 20

Mon Jul 11 07:20:32 UTC 2022

On Fri, 8 Jul 2022 19:22:26 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Bump the version number of JavaFX to 20. I will integrate this to `master` as part of forking the `jfx19` stabilization branch, which is scheduled for Thursday, July 14, 2022 at 16:00 UTC.

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.org/jfx/pull/820