RFR: 8263761: Update boot JDK to 16.0.1

Wed May 19 18:08:38 UTC 2021

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.

It looks like we are still seeing occasional failures in `HonorDeveloperSettingsTest` on Linux. I filed [JDK-8267425](https://bugs.openjdk.java.net/browse/JDK-8267425) to track this.

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