[v8-test262-automation] Updated curation log with latest revision sha's from...

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: 30729e82 targetRevisionAtLastExport: 39246db80e

implementation-contributed/curation_logs/v8.json

 {
-  "sourceRevisionAtLastExport": "30729e82",
-  "targetRevisionAtLastExport": "39246db80e",
+  "sourceRevisionAtLastExport": "1fc8452b",
+  "targetRevisionAtLastExport": "603acd9ca0",
   "curatedFiles": {}
 }
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