[javascriptcore-test262-automation] Updated curation log with latest revision...

[javascriptcore-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: 24719c7634 targetRevisionAtLastExport: f6c4f98d69

implementation-contributed/curation_logs/javascriptcore.json

 {
-  "sourceRevisionAtLastExport": "24719c7634",
-  "targetRevisionAtLastExport": "f6c4f98d69",
+  "sourceRevisionAtLastExport": "5ec2ecf1e4",
+  "targetRevisionAtLastExport": "81663e4556",
   "curatedFiles": {
     "/stress/Number-isNaN-basics.js": "DELETED_IN_TARGET",
     "/stress/Object_static_methods_Object.getOwnPropertyDescriptors-proxy.js": "DELETED_IN_TARGET",