Bumps [github.com/google/trillian](https://github.com/google/trillian) from 1.5.2 to 1.5.3.
- [Release notes](https://github.com/google/trillian/releases)
- [Changelog](https://github.com/google/trillian/blob/master/CHANGELOG.md)
- [Commits](google/trillian@v1.5.2...v1.5.3)

---
updated-dependencies:
- dependency-name: github.com/google/trillian
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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