upgrade immutable

Author: Kenneth Kehl

package-lock.json

@@ -43,7 +43,8 @@
     "python": "^0.0.4",
     "query-command-supported": "1.0.0",
     "sass-embedded": "^1.97.3",
-    "textarea-caret": "3.1.0"
+    "textarea-caret": "3.1.0",
+    "immutable": "^5.1.5"
   },
   "devDependencies": {
     "@babel/core": "^7.29.0",