chore(deps-dev): bump gts from 5.3.0 to 5.3.1 (EndBug#642)

Bumps [gts](https://github.com/google/gts) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/google/gts/releases)
- [Changelog](https://github.com/google/gts/blob/main/CHANGELOG.md)
- [Commits](google/gts@v5.3.0...v5.3.1)

---
updated-dependencies:
- dependency-name: gts
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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