build: upgrade gradle 6.5 -> 8.2.1

[keturn]

Relates to MovingBlocks/Terasology#5109
Relates to MovingBlocks/Terasology#4653

Contains

• Updating gradle from 6.5 -> 8.2.1
• Updating gradle's files for which became invalid

How to test

• run gradlew build -> should build TeraNUI
• we could further test it in combination with Terasology (groovyw lib get TeraNUI && gradlew jar game)

Remarks

Java 20 is not yet supported, see gradle/gradle#23488.

Closes #57

[BenjaminAmos]

This builds and still works with Terasology.

The new Gradle wrapper jar corresponds with Gradle 6.9.2.

[jdrueckert]

@BenjaminAmos @skaldarnar should we backport this to release/v2.x and release/v1.x branches?

[jdrueckert]

The new Gradle wrapper jar corresponds with Gradle 6.9.2.

How would I update this? Just find and copy-paste the 8.2.1 version of it? 🤔
Or is there some gradle command I can run so it updates it itself?

[BenjaminAmos]

Destination Sol is actually using a snapshot from the preview/v4.x-SNAPSHOT branch because of Gestalt 8. I can handle backporting to there. I do not believe that either the release/v1.x or the release/v2.x branch is used anywhere anymore.

[BenjaminAmos]

The new Gradle wrapper jar corresponds with Gradle 6.9.2.

How would I update this? Just find and copy-paste the 8.2.1 version of it? 🤔 Or is there some gradle command I can run so it updates it itself?

You can use the gradlew wrapper command to update the wrapper itself. I linked to the release checksums page above just in-case somebody wished to verify that the wrapper jar was identical to the official wrapper.