* ci: add Java 16 to GH Actions build flow
With our new dependence on Java 16+ as of Minecraft 1.17 (refer to:
https://www.minecraft.net/en-us/article/minecraft-snapshot-21w19a), we
should also ensure everything we merge builds on Java 16.
Signed-off-by: Mariell Hoversholm <proximyst@proximyst.com>
* ci: remove Java 11 from build flow
Signed-off-by: Mariell Hoversholm <proximyst@proximyst.com>