crypto: fix KeyObject garbage collection

These objects don’t hold any resources on the event loop, so they
should be weak objects that can be garbage collected when nothing
refers to them anymore.

PR-URL: nodejs#35481
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

src/node_crypto.h

@@ -519,7 +519,9 @@ class NativeKeyObject : public BaseObject {
                   v8::Local<v8::Object> wrap,
                   const std::shared_ptr<KeyObjectData>& handle_data)
     : BaseObject(env, wrap),
-      handle_data_(handle_data) {}
+      handle_data_(handle_data) {
+    MakeWeak();
+  }
 
   std::shared_ptr<KeyObjectData> handle_data_;
 };