Update rspec-mocks requirement from 3.4.0 to 3.9.0
Update rspec-mocks requirement from 3.4.0 to 3.9.0

Updates the requirements on [rspec-mocks](https://github.com/rspec/rspec-mocks) to permit the latest version.
- [Release notes](https://github.com/rspec/rspec-mocks/releases)
- [Changelog](https://github.com/rspec/rspec-mocks/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-mocks/compare/v3.4.0...v3.9.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
chef/artifactory-client,chef/artifactory-client