build(deps): bump braze-specification from 517b8ce to f20daf4

Bumps [braze-specification](https://github.com/braze-community/braze-specification) from `517b8ce` to `f20daf4`.
- [Release notes](https://github.com/braze-community/braze-specification/releases)
- [Commits](braze-community/braze-specification@517b8ce...f20daf4)

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

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