build: revert to Minecraft version 1.21.5 due to undocumented breaking changes

gradle.properties

@@ -4,8 +4,8 @@ org.gradle.parallel=true
 
 # Fabric Properties
 # check these on https://fabricmc.net/develop
-minecraft_version=1.21.8
-yarn_mappings=1.21.8+build.1
+minecraft_version=1.21.5
+yarn_mappings=1.21.5+build.1
 loader_version=0.17.2
 loom_version=1.11-SNAPSHOT
 
@@ -16,4 +16,4 @@ archives_base_name=magic_mod
 
 # Dependencies
 # Fabric API
-fabric_version=0.133.0+1.21.8
+fabric_version=0.128.2+1.21.5