Bump testdata/specifications from 6118deb to 43d2c7b

Bumps [testdata/specifications](https://github.com/mongodb/specifications) from `6118deb` to `43d2c7b`.
- [Release notes](https://github.com/mongodb/specifications/releases)
- [Commits](mongodb/specifications@6118deb...43d2c7b)

---
updated-dependencies:
- dependency-name: testdata/specifications
  dependency-version: 43d2c7bacd62249de8d2173bf8ee39e6fd7a686e
  dependency-type: direct:production
...

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

Author: dependabot[bot]