ci(java): ignore bot users for generate-files-bot (googleapis#524)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/5204afce-766b-4a81-9152-05f5c11b5df8/targets

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Source-Link: googleapis/synthtool@3f67cee

.github/generated-files-bot.yml

@@ -5,3 +5,7 @@ externalManifests:
 - type: json
   file: '.github/readme/synth.metadata/synth.metadata'
   jsonpath: '$.generatedFiles[*]'
+ignoreAuthors:
+- 'renovate-bot'
+- 'yoshi-automation'
+- 'release-please[bot]'

synth.metadata

@@ -3,15 +3,15 @@
     {
       "git": {
         "name": ".",
-        "remote": "git@github.com:googleapis/google-auth-library-java.git",
-        "sha": "0a8412fcf9de4ac568b9f88618e44087dd31b144"
+        "remote": "https://github.com/googleapis/google-auth-library-java.git",
+        "sha": "5a1d5c0f56c62311b646ffbdc2e39affa55d5c0c"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "996775eca5fd934edac3c2ae34b80ff0395b1717"
+        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
       }
     }
   ],