Bump github.com/golang/mock from 1.3.1 to 1.4.4

Bumps [github.com/golang/mock](https://github.com/golang/mock) from 1.3.1 to 1.4.4.
- [Release notes](https://github.com/golang/mock/releases)
- [Changelog](https://github.com/golang/mock/blob/master/.goreleaser.yml)
- [Commits](https://github.com/golang/mock/compare/1.3.1...v1.4.4

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