Bump tests/specifications from ce9b56b to 787bbe6 (#1553)

Bumps [tests/specifications](https://github.com/mongodb/specifications) from `ce9b56b` to `787bbe6`.
- [Release notes](https://github.com/mongodb/specifications/releases)
- [Commits](mongodb/specifications@ce9b56b...787bbe6)

---
updated-dependencies:
- dependency-name: tests/specifications
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]