Fix code scanning alert no. 234: Prototype-polluting function

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

openc3-cosmos-init/plugins/packages/openc3-cosmos-ace-diff/src/helpers/merge.js

@@ -17,6 +17,7 @@ function isObject(item) {
 export default function merge(target, source) {
   if (isObject(target) && isObject(source)) {
     Object.keys(source).forEach((key) => {
+      if (key === "__proto__" || key === "constructor") return;
       if (isObject(source[key])) {
         if (!target[key] || !isObject(target[key])) {
           target[key] = source[key]