Bump tests/specifications from 7a3f70f to ac0b0ad (mongodb#1933)

Bumps [tests/specifications](https://github.com/mongodb/specifications) from `7a3f70f` to `ac0b0ad`.
- [Release notes](https://github.com/mongodb/specifications/releases)
- [Commits](mongodb/specifications@7a3f70f...ac0b0ad)

---
updated-dependencies:
- dependency-name: tests/specifications
  dependency-version: ac0b0ad6e2c347c72990804b61119e45716545d0
  dependency-type: direct:production
...

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