[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: 8a73712b6a targetRevisionAtLastExport: 8e73aadc

implementation-contributed/curation_logs/javascriptcore.json

 {
-  "sourceRevisionAtLastExport": "8a73712b6a",
-  "targetRevisionAtLastExport": "8e73aadc2",
+  "sourceRevisionAtLastExport": "a7577363f7",
+  "targetRevisionAtLastExport": "1f7948aa7",
   "curatedFiles": {
     "/stress/Number-isNaN-basics.js": "DELETED_IN_TARGET",
     "/stress/Object_static_methods_Object.getOwnPropertyDescriptors-proxy.js": "DELETED_IN_TARGET",