RFR: 8263761: Update boot JDK to 16.0.1

[Ambarish Rapte]

On Wed, 19 May 2021 17:28:34 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This PR updates the boot JDK for JavaFX builds to use JDK 16.0.1. The minimum version of the JDK remains unchanged at JDK 11.

Linux build failure is not related to this change, 
failed test: test.javafx.css.HonorDeveloperSettingsTest > testOpacityWithManuallyChangedValueAndInlineStyleIsSetToInlineStyle FAILED
Looks like the fix of #496 is not sufficient.

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PR: https://git.openjdk.java.net/jfx/pull/507