chore: update cloud rad kokoro build job (#393)

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Source-Link: googleapis/synthtool@bd0deaa

packages/google-cloud-bigquery-datatransfer/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-bigquery-data-transfer.git",
-        "sha": "5be5681c8447ccf884537588b1b56dfc49733b67"
+        "sha": "5620e08d3405dc2d6b4b1c978a98e133a6945eaa"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "94421c47802f56a44c320257b2b4c190dc7d6b68"
+        "sha": "bd0deaa1113b588d70449535ab9cbf0f2bd0e72f"
       }
     }
   ],