feat: add gcf-owl-bot[bot] to ignoreAuthors (#452)

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Source-Link: googleapis/synthtool@7332178

packages/google-cloud-dns/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dns.git",
-        "sha": "f3db0931622f2f7c9e177d533a5337baa4386284"
+        "sha": "44d512b7e00fce48577204e235b017644555e2d0"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "b891fb474173f810051a7fdb0d66915e0a9bc82f"
+        "sha": "7332178a11ddddc91188dc0f25bca1ccadcaa6c6"
       }
     }
   ]