chore: for Java repos RenovateBot to ignore GitHub Actions workflow file (#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://github.com/googleapis/synthtool/commit/1543029c843989702adbe789acdead153ad696d1
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:88ba8dcc5c2c7792e1c3511381f4ab329002a1c42c512f66ca87ced572dfbf9f

Author: gcf-owl-bot[bot]

.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