feat: add gcf-owl-bot[bot] to ignoreAuthors (#690)

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Source-Link: googleapis/synthtool@7332178

.github/generated-files-bot.yml

@@ -9,3 +9,4 @@ ignoreAuthors:
 - 'renovate-bot'
 - 'yoshi-automation'
 - 'release-please[bot]'
+- 'gcf-owl-bot[bot]'

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-oauth-java-client.git",
-        "sha": "354e088a58165549246bdee1757b46af905fcd59"
+        "sha": "f50351421000fc6bdfc3674070f577cb8d3523cf"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c86c7a60985644eab557949363a38301d40d78d2"
+        "sha": "7332178a11ddddc91188dc0f25bca1ccadcaa6c6"
       }
     }
   ],