[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: ac250b9b targetRevisionAtLastExport: 6218e682b2

implementation-contributed/curation_logs/v8.json

 {
-  "sourceRevisionAtLastExport": "ac250b9b",
-  "targetRevisionAtLastExport": "6218e682b2",
+  "sourceRevisionAtLastExport": "3a8c8082",
+  "targetRevisionAtLastExport": "9166165df7",
   "curatedFiles": {}
 }
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