chore(deps-dev): bump relay-test-utils in /frontend

Bumps [relay-test-utils](https://github.com/facebook/relay/tree/HEAD/packages/relay-test-utils) from 17.0.0 to 20.1.1.
- [Release notes](https://github.com/facebook/relay/releases)
- [Commits](https://github.com/facebook/relay/commits/v20.1.1/packages/relay-test-utils)

---
updated-dependencies:
- dependency-name: relay-test-utils
  dependency-version: 20.1.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]