build(deps): bump braze-specification from 10a26bf to 6d4abcd

Bumps [braze-specification](https://github.com/braze-community/braze-specification) from `10a26bf` to `6d4abcd`.
- [Release notes](https://github.com/braze-community/braze-specification/releases)
- [Commits](braze-community/braze-specification@10a26bf...6d4abcd)

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

Signed-off-by: dependabot[bot] <[email protected]>