Bump lmbda to 3.0.0, defining generated handlers with the proxy's lookup instead of the plugin's

Reapplies the lmbda 3.0.0 bump reverted in f918d0d6.

gradle/libs.versions.toml

@@ -40,7 +40,7 @@ kyori-ansi = "net.kyori:ansi:1.1.1"
 guava = "com.google.guava:guava:33.6.0-jre"
 gson = "com.google.code.gson:gson:2.14.0"
 guice = "com.google.inject:guice:7.0.0"
-lmbda = "org.lanternpowered:lmbda:2.0.0"
+lmbda = "org.lanternpowered:lmbda:3.0.0"
 log4j-api = { module = "org.apache.logging.log4j:log4j-api", version.ref = "log4j" }
 log4j-core = { module = "org.apache.logging.log4j:log4j-core", version.ref = "log4j" }
 log4j-slf4j-impl = { module = "org.apache.logging.log4j:log4j-slf4j2-impl", version.ref = "log4j" }

proxy/src/main/java/com/velocitypowered/proxy/event/CustomHandlerAdapter.java

@@ -60,9 +60,7 @@ final class CustomHandlerAdapter<F> {
   UntargetedEventHandler buildUntargetedHandler(final Method method)
       throws IllegalAccessException {
     final MethodHandle methodHandle = methodHandlesLookup.unreflect(method);
-    final MethodHandles.Lookup defineLookup = MethodHandles.privateLookupIn(
-        method.getDeclaringClass(), methodHandlesLookup);
-    final LambdaType<F> lambdaType = functionType.defineClassesWith(defineLookup);
+    final LambdaType<F> lambdaType = functionType.defineClassesWith(methodHandlesLookup);
     final F invokeFunction = LambdaFactory.create(lambdaType, methodHandle);
     final BiFunction<Object, Object, EventTask> handlerFunction =
         handlerBuilder.apply(invokeFunction);

proxy/src/main/java/com/velocitypowered/proxy/event/VelocityEventManager.java

@@ -243,7 +243,7 @@ public class VelocityEventManager implements EventManager {
     } else {
       type = untargetedVoidHandlerType;
     }
-    return LambdaFactory.create(type.defineClassesWith(lookup), methodHandle);
+    return LambdaFactory.create(type.defineClassesWith(methodHandlesLookup), methodHandle);
   }
 
   static final class MethodHandlerInfo {