http: be more generational GC friendly

Avoid any potential ref to Buffer in new generation
from old generation

PR-URL: #56767
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: ywave620

lib/_http_outgoing.js

@@ -1172,6 +1172,8 @@ OutgoingMessage.prototype._flushOutput = function _flushOutput(socket) {
   // Refs: https://github.com/nodejs/node/pull/30958
   for (let i = 0; i < outputLength; i++) {
     const { data, encoding, callback } = outputData[i];
+    // Avoid any potential ref to Buffer in new generation from old generation
+    outputData[i].data = null;
     ret = socket.write(data, encoding, callback);
   }
   socket.uncork();