RFR: 8263761: Update boot JDK to 16.0.1

[Kevin Rushforth]

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.

-------------

Commit messages:
 - 8263761: Update boot JDK to 16.0.1

Changes: https://git.openjdk.java.net/jfx/pull/507/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=507&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263761
  Stats: 11 lines in 2 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jfx/pull/507.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/507/head:pull/507

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