Bump brotli from 1.1.0 to 1.2.0 in /requirements (#9048)

Bumps [brotli](https://github.com/google/brotli) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/google/brotli/releases)
- [Changelog](https://github.com/google/brotli/blob/master/CHANGELOG.md)
- [Commits](google/brotli@go/cbrotli/v1.1.0...v1.2.0)

---
updated-dependencies:
- dependency-name: brotli
  dependency-version: 1.2.0
  dependency-type: indirect
...

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