build(deps): bump braze-specification from 6d2b78c to 9b6cd38

Bumps [braze-specification](https://github.com/braze-community/braze-specification) from `6d2b78c` to `9b6cd38`.
- [Release notes](https://github.com/braze-community/braze-specification/releases)
- [Commits](braze-community/braze-specification@6d2b78c...9b6cd38)

---
updated-dependencies:
- dependency-name: braze-specification
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>