Fix deprecation warnings with V8 14.4

PropertyCallbackInfo<>::This() is now deprecated, HolderV2() is to be used
instead.

Author: fhanau

src/workerd/jsg/resource.h

@@ -635,7 +635,7 @@ struct GetterCallback;
       liftKj(info, [&]() {                                                                         \
         auto isolate = info.GetIsolate();                                                          \
         auto context = isolate->GetCurrentContext();                                               \
-        auto obj = info.This();                                                                    \
+        auto obj = info.HolderV2();                                                                \
         auto& js = Lock::from(isolate);                                                            \
         auto& wrapper = TypeWrapper::from(isolate);                                                \
         /* V8 no longer supports AccessorSignature, so we must manually verify `this`'s type. */   \
@@ -682,7 +682,7 @@ struct GetterCallback;
         auto isolate = info.GetIsolate();                                                          \
         auto context = isolate->GetCurrentContext();                                               \
         auto& js = Lock::from(isolate);                                                            \
-        auto obj = info.This();                                                                    \
+        auto obj = info.HolderV2();                                                                \
         auto& wrapper = TypeWrapper::from(isolate);                                                \
         /* V8 no longer supports AccessorSignature, so we must manually verify `this`'s type. */   \
         if (!isContext &&                                                                          \
@@ -880,7 +880,7 @@ struct SetterCallback<TypeWrapper, methodName, void (T::*)(Arg), method, isConte
       auto isolate = info.GetIsolate();
       auto context = isolate->GetCurrentContext();
       auto& js = Lock::from(isolate);
-      auto obj = info.This();
+      auto obj = info.HolderV2();
       auto& wrapper = TypeWrapper::from(isolate);
       // V8 no longer supports AccessorSignature, so we must manually verify `this`'s type.
       if (!isContext && !wrapper.getTemplate(isolate, static_cast<T*>(nullptr))->HasInstance(obj)) {
@@ -906,7 +906,7 @@ struct SetterCallback<TypeWrapper, methodName, void (T::*)(Lock&, Arg), method,
     liftKj(info, [&]() {
       auto isolate = info.GetIsolate();
       auto context = isolate->GetCurrentContext();
-      auto obj = info.This();
+      auto obj = info.HolderV2();
       auto& wrapper = TypeWrapper::from(isolate);
       // V8 no longer supports AccessorSignature, so we must manually verify `this`'s type.
       if (!isContext && !wrapper.getTemplate(isolate, static_cast<T*>(nullptr))->HasInstance(obj)) {
@@ -1193,7 +1193,7 @@ struct WildcardPropertyCallbacks<TypeWrapper,
     liftKj(info, [&]() -> v8::Local<v8::Value> {
       auto isolate = info.GetIsolate();
       auto context = isolate->GetCurrentContext();
-      auto obj = info.This();
+      auto obj = info.HolderV2();
       auto& wrapper = TypeWrapper::from(isolate);
       if (!wrapper.getTemplate(isolate, static_cast<T*>(nullptr))->HasInstance(obj)) {
         throwTypeError(isolate, kIllegalInvocation);