use yarn mappings

build.gradle

@@ -39,7 +39,7 @@ fabricApi {
 dependencies {
 	// To change the versions see the gradle.properties file
 	minecraft "com.mojang:minecraft:${project.minecraft_version}"
-	mappings loom.officialMojangMappings()
+	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
 	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
 	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_api_version}"
 }

gradle.properties

@@ -8,6 +8,7 @@ org.gradle.configuration-cache=false
 # Fabric Properties
 # check these on https://fabricmc.net/develop
 minecraft_version=1.21.11
+yarn_mappings=1.21.11+build.4
 loader_version=0.19.2
 loom_version=1.15-SNAPSHOT
 

src/client/java/skybakery/mixin/client/ExampleClientMixin.java

@@ -1,15 +1,8 @@
 package skybakery.mixin.client;
 
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-@Mixin(Minecraft.class)
+@Mixin(MinecraftClient.class)
 public class ExampleClientMixin {
-	@Inject(at = @At("HEAD"), method = "run")
-	private void init(CallbackInfo info) {
-		// This code is injected into the start of Minecraft.run()V
-	}
 }

src/main/java/skybakery/mixin/ExampleMixin.java

@@ -2,14 +2,7 @@ package skybakery.mixin;
 
 import net.minecraft.server.MinecraftServer;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 @Mixin(MinecraftServer.class)
 public class ExampleMixin {
-	@Inject(at = @At("HEAD"), method = "loadLevel")
-	private void init(CallbackInfo info) {
-		// This code is injected into the start of MinecraftServer.loadLevel()V
-	}
 }

src/main/resources/fabric.mod.json

@@ -5,7 +5,7 @@
 	"name": "SkyBakery",
 	"description": "This is an example description! Tell everyone what your mod is about!",
 	"authors": [
-		"Me!"
+		"Caleb Burke"
 	],
 	"contact": {
 		"homepage": "https://fabricmc.net/",