feat: add gcf-owl-bot[bot] to ignoreAuthors (#474)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/35db7954-f063-42f8-9ff3-5d189e94e5d3/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Source-Link: googleapis/synthtool@7332178

Author: yoshi-automation

.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/java-spanner-jdbc.git",
-        "sha": "c42f7f7014cc24c32012aca8d2aa324c7cbc6e37"
+        "sha": "8a6a8529e0f832b21c07ec40adb448bd77c5b02c"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c86c7a60985644eab557949363a38301d40d78d2"
+        "sha": "7332178a11ddddc91188dc0f25bca1ccadcaa6c6"
       }
     }
   ],