build: add generated-files bot config (#247)

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Source-Link: googleapis/synthtool@e6f3d54
Source-Link: googleapis/synthtool@04573fd

packages/google-cloud-datacatalog/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-datacatalog.git",
-        "sha": "b71d34e5f7f12dc4716949e1ba09ab1e1defe3b7"
+        "sha": "1efaf9be12b84135643761cf01372726ec7dd249"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c6706ee5d693e9ae5967614170732646590d8374"
+        "sha": "e6f3d54be015a394b6ab5a25903ec09062a2b424"
       }
     }
   ],