chore: for Java repos RenovateBot to ignore GitHub Actions workflow f…

…ile (#1855) (#2609)

chore: for Java repos RenovateBot to ignore GitHub Actions workflow file

The actions used in the GitHub Actions workflow files do not appear in libraries' dependencies and mostly maintained by Java postprocessor templates.

IgnorePath option document: https://docs.renovatebot.com/configuration-options/
Source-Link: https://togithub.com/googleapis/synthtool/commit/1543029c843989702adbe789acdead153ad696d1
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:88ba8dcc5c2c7792e1c3511381f4ab329002a1c42c512f66ca87ced572dfbf9f

.github/.OwlBot.lock.yaml

@@ -14,4 +14,4 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
   digest: sha256:fb7584f6adb3847ac480ed49a4bfe1463965026b2919a1be270e3174f3ce1191
-# created: 2023-10-26T23:22:21.357007231Z
+# created: 2023-10-26T23:22:21.357007231Z