[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: a2f7b0c562 targetRevisionAtLastExport: 5594c916

implementation-contributed/curation_logs/javascriptcore.json

 {
-  "sourceRevisionAtLastExport": "a2f7b0c562",
-  "targetRevisionAtLastExport": "5594c916b",
+  "sourceRevisionAtLastExport": "873fa026de",
+  "targetRevisionAtLastExport": "92b6974df",
   "curatedFiles": {
     "/stress/Number-isNaN-basics.js": "DELETED_IN_TARGET",
     "/stress/Object_static_methods_Object.getOwnPropertyDescriptors-proxy.js": "DELETED_IN_TARGET",