RFR: 8248317: Change JavaFX release version to 16

Tue Jun 30 15:41:29 UTC 2020

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On Tue, 30 Jun 2020 15:30:31 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Bump the version number of JavaFX to 16. I will integrate this immediately after forking the `jfx15` stabilization
> branch.

@arapte please review

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PR: https://git.openjdk.java.net/jfx/pull/260