fix: build

Author: OptiJava

gradle.properties

@@ -1,9 +1,9 @@
 # Gradle Configurations
-org.gradle.jvmargs=-Xmx2560M
+org.gradle.jvmargs=-Xmx4g
 org.gradle.parallel=true
 
 # Fabric Configurations
-loader_version=0.15.6
+loader_version=0.15.11
 loader_requirement_version=>=0.15
 
 # Mod Metadata

src/main/resources/opt-carpet-addition.mixins.json

@@ -2,7 +2,9 @@
   "required": false,
   "minVersion": "0.8",
   "package": "io.github.optijava.opt_carpet_addition.mixins",
-  //#if MC >= 11800
+  //#if MC >= 12100
+  //$$ "compatibilityLevel": "JAVA_21",
+  //#elseif MC >= 11800
   //$$ "compatibilityLevel": "JAVA_17",
   //#else
   "compatibilityLevel": "JAVA_16",