Bump net.neoforged:neoforge from 21.0.6-beta to 21.1.8

Bumps [net.neoforged:neoforge](https://github.com/NeoForged/NeoForge) from 21.0.6-beta to 21.1.8.
- [Commits](https://github.com/NeoForged/NeoForge/commits)

---
updated-dependencies:
- dependency-name: net.neoforged:neoforge
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 minecraft = "1.21"
 parchment = "2024.04.14"
 
-neoforge = "21.0.6-beta"
+neoforge = "21.1.8"
 
 fabric_loader = "0.15.11"
 fabric_api = "0.100.1+1.21"