ci(java): ignore bot users for generate-files-bot (#305)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/88a97252-efa1-41f8-87c9-1a1ef3bd41cf/targets

- [ ] To automatically regenerate this PR, check this box.

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner-jdbc.git",
-        "sha": "5531536d406e1fe3043a9d379c8102f1b0a5ade7"
+        "sha": "8e01a57aad6d2ea85b37c5782d566b1587d0f41c"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5d11bd2888c38ce1fb6fa6bf25494a4219a73928"
+        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
       }
     }
   ],