[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: cac6b037 targetRevisionAtLastExport: 4dc4cfd8

implementation-contributed/curation_logs/v8.json

 {
-  "sourceRevisionAtLastExport": "cac6b037",
-  "targetRevisionAtLastExport": "4dc4cfd817",
+  "sourceRevisionAtLastExport": "4a395137",
+  "targetRevisionAtLastExport": "07b313100e",
   "curatedFiles": {}
 }
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