[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: f09bec92 targetRevisionAtLastExport: bb9647dd

implementation-contributed/curation_logs/v8.json

 {
-  "sourceRevisionAtLastExport": "f09bec92",
-  "targetRevisionAtLastExport": "bb9647dd4b",
+  "sourceRevisionAtLastExport": "a8673918",
+  "targetRevisionAtLastExport": "fc9d2bbf73",
   "curatedFiles": {}
 }
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