Chore(deps): Bump mockall from 0.14.0 to 0.15.0 (#1773)

Bumps [mockall](https://github.com/asomers/mockall) from 0.14.0 to 0.15.0.
- [Changelog](https://github.com/asomers/mockall/blob/master/CHANGELOG.md)
- [Commits](https://github.com/asomers/mockall/compare/v0.14.0...v0.15.0)

---
updated-dependencies:
- dependency-name: mockall
  dependency-version: 0.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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