Bump Fabric loader version

Required for Fabric tests to work. Yeah, I should have tested this
before pushing :D.

Author: SquidDev

gradle/libs.versions.toml

@@ -8,7 +8,7 @@
 # MC version is specified in gradle.properties, as we need that in settings.gradle.
 # Remember to update corresponding versions in fabric.mod.json/mods.toml
 fabric-api = "0.86.1+1.20.1"
-fabric-loader = "0.14.21"
+fabric-loader = "0.18.4"
 forge = "47.1.0"
 forgeSpi = "7.0.1"
 mixin = "0.8.5"