build(deps): bump com.google.cloud:google-cloud-shared-config (#2536)

Bumps [com.google.cloud:google-cloud-shared-config](https://github.com/googleapis/java-shared-config) from 1.11.3 to 1.12.0.
- [Release notes](https://github.com/googleapis/java-shared-config/releases)
- [Changelog](https://github.com/googleapis/java-shared-config/blob/main/CHANGELOG.md)
- [Commits](googleapis/java-shared-config@v1.11.3...v1.12.0)

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

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