Apply no-buffer-constructor lint rule

lib/cwmp.js

@@ -1058,7 +1058,7 @@ function listener(httpRequest, httpResponse) {
   });
 
   stream.on("end", () => {
-    const body = new Buffer(bytes);
+    const body = Buffer.allocUnsafe(bytes);
     let offset = 0;
     for (const chunk of chunks) {
       chunk.copy(body, offset, 0, chunk.length);