Port cause_lag_by_disabling_threads to 1.21.3

Author: rhysdh540

common/src/main/java/org/embeddedt/modernfix/common/mixin/feature/cause_lag_by_disabling_threads/UtilMixin.java

@@ -1,16 +1,15 @@
 package org.embeddedt.modernfix.common.mixin.feature.cause_lag_by_disabling_threads;
 
+import net.minecraft.TracingExecutor;
 import net.minecraft.Util;
 import org.embeddedt.modernfix.util.DirectExecutorService;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.Shadow;
 
-import java.util.concurrent.ExecutorService;
-
 @Mixin(Util.class)
 public class UtilMixin {
     @Shadow @Final @Mutable
-    private static final ExecutorService BACKGROUND_EXECUTOR = new DirectExecutorService();
+    private static final TracingExecutor BACKGROUND_EXECUTOR = new TracingExecutor(new DirectExecutorService());
 }