Attempts to combat more memory leaks in vanilla chunk system

[ishland]

Also updates tooling because it was using a prerelease version of neo-loom.

Changes:

• Further guards memory leak race condition in entity chunks
• Attempts to boost priority of unloading chunks higher than most other chunk loading tasks, so chunks unloads more quickly. This may slow down pregen but it's for the better.
  There's also a patch to mitigate a vanilla chunk system bug where priority are not applied properly due to a race condition in vanilla.

Would like some review before I port these changes to forge and neoforge.