Bump com.google.cloud:google-cloud-secretmanager from 2.55.0 to 2.56.0 (

#304)

Bumps [com.google.cloud:google-cloud-secretmanager](https://github.com/googleapis/google-cloud-java) from 2.55.0 to 2.56.0.
- [Release notes](https://github.com/googleapis/google-cloud-java/releases)
- [Changelog](https://github.com/googleapis/google-cloud-java/blob/main/java-document-ai/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-java/commits)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-secretmanager
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: Conor Heffron <conor.heffron@gmail.com>