build: add generated-files bot config (#368)

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

packages/google-cloud-resourcemanager/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-resource.git",
-        "sha": "f36c1ab91fd2465efccd2d8a286e06391c2cc97f"
+        "sha": "5f730458651b5f2063b1f74b5e5240dc577e34ef"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "ff6b759fcb58f216f62b48d5be0bb85fafbc3bb2"
+        "sha": "e6f3d54be015a394b6ab5a25903ec09062a2b424"
       }
     }
   ]