Bump testdata/specifications from 6689929 to 5ef7b1b

Bumps [testdata/specifications](https://github.com/mongodb/specifications) from `6689929` to `5ef7b1b`.
- [Release notes](https://github.com/mongodb/specifications/releases)
- [Commits](mongodb/specifications@6689929...5ef7b1b)

---
updated-dependencies:
- dependency-name: testdata/specifications
  dependency-version: 5ef7b1bc0acb1d18f7dce8df74b7cdac40f4cf33
  dependency-type: direct:production
...

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

Author: dependabot[bot]