RFR: 8240542: Switch FX build to use JDK 14 as boot JDK

[Ambarish Rapte]

On Thu, 26 Mar 2020 18:46:15 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Now that we have switched to using gradle 6.3 we can switch to using JDK 14 as the boot JDK for JavaFX 15 builds.
> 
> This will not change the minimum JDK version needed to build or run JavaFX, which remains at 11. We will continue to
> generate class files using `-source 11 -target 11`.

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/152