Use rfdc module for cloning when we know its pure JSON

packages/node_modules/@node-red/runtime/lib/nodes/index.js

@@ -14,9 +14,8 @@
  * limitations under the License.
  **/
 
-var path = require("path");
-var fs = require("fs");
-var clone = require("clone");
+
+const jsonClone = require("rfdc")();
 var util = require("util");
 
 var registry = require("@node-red/registry");
@@ -98,7 +97,7 @@ function createNode(node,def) {
     }
     var creds = credentials.get(id);
     if (creds) {
-        creds = clone(creds);
+        creds = jsonClone(creds);
         //console.log("Attaching credentials to ",node.id);
         // allow $(foo) syntax to substitute env variables for credentials also...
         for (var p in creds) {