Bump @protobufjs/utf8 in /unit-test-security-rules-v9

Bumps [@protobufjs/utf8](https://github.com/dcodeIO/protobuf.js) from 1.1.0 to 1.1.1.
- [Release notes](https://github.com/dcodeIO/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/master/CHANGELOG.md)
- [Commits](protobufjs/protobuf.js@protobufjs-cli-v1.1.0...protobufjs-cli-v1.1.1)

---
updated-dependencies:
- dependency-name: "@protobufjs/utf8"
  dependency-version: 1.1.1
  dependency-type: indirect
...

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Author: dependabot[bot]