Update builds to use new JDK source

[Phergus]

Is your feature request related to a problem? Please describe.
AdoptOpen has changed it's name to Eclipse Adoptium project and the JDK downloads have a new download location.

See: https://blog.adoptopenjdk.net/2021/03/transition-to-eclipse-an-update/

Describe the solution you'd like
Update build.gradle to use the new download location:

Current Java 16.0.2 URLs.

https://github.com/adoptium/temurin16-binaries/releases/download/jdk-16.0.2%2B7/OpenJDK16U-jdk_x64_linux_hotspot_16.0.2_7.tar.gz
https://github.com/adoptium/temurin16-binaries/releases/download/jdk-16.0.2%2B7/OpenJDK16U-jdk_x64_windows_hotspot_16.0.2_7.zip
https://github.com/adoptium/temurin16-binaries/releases/download/jdk-16.0.2%2B7/OpenJDK16U-jdk_x64_mac_hotspot_16.0.2_7.tar.gz

Or current Java 17 downloads:

https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17%2B35/OpenJDK17-jdk_x64_linux_hotspot_17_35.tar.gz
https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17%2B35/OpenJDK17-jdk_x64_windows_hotspot_17_35.zip
https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17%2B35/OpenJDK17-jdk_x64_mac_hotspot_17_35.tar.gz

Additional context
Added benefit of this 16.0.2 Java is the fix for the drag-n-drop freeze on Windows. #2781
Moving to Java 17 resolves issue #2754.

[Phergus]

Pushing PR to more to the 16.0.2_7 JDKs.

Can possibly move to JDK 17 after more testing.

[Phergus]

No problems seen with 16.0.2_7 JDKs. Move to Java 17 can come later.