NeoForge support (1.20.6, 1.21.1, 1.21.4)

[minimusubi]

Adds support for NeoForge on the three relevant versions:

• 1.20.6 (last version of 1.20) (untested)
• 1.21.1 (most mod-supported version of 1.21)
• 1.21.4 (latest version of 1.21) (untested)

Notes

• Updated NeoGradle to 7.0.178
• Updated Gradle (and Gradle wrapper) from 8.7 to 8.12 for newer NeoGradle support
• Updated fabric-loom from 1.6.11 to 1.9.2 for newer Gradle support

* The fabric-loom upgrade was done based off of 30d6845bb233f0dce88589c221faf68e58a3e336, but after the recent merges, may not be required