Bump protobufjs from 6.11.3 to 6.11.4 in /docs (#1914)

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) from 6.11.3 to 6.11.4.
- [Release notes](https://github.com/protobufjs/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/protobufjs/protobuf.js/commits)

---
updated-dependencies:
- dependency-name: protobufjs
  dependency-type: indirect
...

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Author: dependabot[bot]