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

Depends on googleapis/repo-automation-bots#1254

Fixes googleapis/repo-automation-bots#1096

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Tue Dec 15 16:16:07 2020 -0800
Source-Repo: googleapis/synthtool
Source-Sha: 3f67ceece7e797a5736a25488aae35405649b90b
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

@@ -50,7 +50,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5d11bd2888c38ce1fb6fa6bf25494a4219a73928"
+        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
       }
     }
   ],