v8: replace Buffer with FastBuffer in deserialize

Replace the Buffer constructor with a FastBuffer in v8.deserialize in
order to avoid calling the Buffer constructor and thus triggering a
deprecation warning from code inside the core.

Fixes: nodejs#21181

lib/v8.js

@@ -143,7 +143,7 @@ const arrayBufferViewTypeToIndex = new Map();
   }
 }
 
-const bufferConstructorIndex = arrayBufferViewTypes.push(Buffer) - 1;
+const bufferConstructorIndex = arrayBufferViewTypes.push(FastBuffer) - 1;
 
 class DefaultSerializer extends Serializer {
   constructor() {