[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: 0039b340 targetRevisionAtLastExport: 6ddea08809

implementation-contributed/curation_logs/v8.json

 {
-  "sourceRevisionAtLastExport": "0039b340",
-  "targetRevisionAtLastExport": "6ddea08809",
+  "sourceRevisionAtLastExport": "0d75b76c",
+  "targetRevisionAtLastExport": "7df6ae12f6",
   "curatedFiles": {}
 }
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