ci(java): ignore bot users for generate-files-bot (#376)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/14d66b96-4e42-4fc8-851c-9e7ade6c839a/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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-translate.git",
-        "sha": "def21c6aa4f978f695ba4054ae2829231ad33c48"
+        "sha": "97eee7d639154965749cc85b293fe19954fbf390"
       }
     },
     {
@@ -27,7 +27,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5d11bd2888c38ce1fb6fa6bf25494a4219a73928"
+        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
       }
     }
   ],