chore: update cloud rad kokoro build job (#419)

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Source-Link: googleapis/synthtool@bd0deaa

packages/google-cloud-dns/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dns.git",
-        "sha": "f96c2ad5078eb0294a1ea75fec48252de743087e"
+        "sha": "b023225c6d694da3541ec048d60f27564d974090"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "94421c47802f56a44c320257b2b4c190dc7d6b68"
+        "sha": "bd0deaa1113b588d70449535ab9cbf0f2bd0e72f"
       }
     }
   ]