Bump protobufjs and @google-cloud/pubsub in /ingestion/streaming

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) to 7.5.5 and updates ancestor dependency [@google-cloud/pubsub](https://github.com/googleapis/nodejs-pubsub). These dependencies need to be updated together.


Updates `protobufjs` from 6.11.3 to 7.5.5
- [Release notes](https://github.com/protobufjs/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/master/CHANGELOG.md)
- [Commits](protobufjs/protobuf.js@v6.11.3...protobufjs-v7.5.5)

Updates `@google-cloud/pubsub` from 3.0.1 to 5.3.0
- [Release notes](https://github.com/googleapis/nodejs-pubsub/releases)
- [Changelog](https://github.com/googleapis/nodejs-pubsub/blob/main/CHANGELOG.md)
- [Commits](googleapis/nodejs-pubsub@v3.0.1...v5.3.0)

---
updated-dependencies:
- dependency-name: protobufjs
  dependency-version: 7.5.5
  dependency-type: indirect
- dependency-name: "@google-cloud/pubsub"
  dependency-version: 5.3.0
  dependency-type: direct:production
...

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Author: dependabot[bot]