Bump rubocop-minitest from 0.39.1 to 0.40.0 in the rubocop group

Bump rubocop-minitest from 0.39.1 to 0.40.0 in the rubocop group

Bumps the rubocop group with 1 update: [rubocop-minitest](https://github.com/rubocop/rubocop-minitest).

Updates `rubocop-minitest` from 0.39.1 to 0.40.0
- [Release notes](https://github.com/rubocop/rubocop-minitest/releases)
- [Changelog](https://github.com/rubocop/rubocop-minitest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-minitest/compare/v0.39.1...v0.40.0)

---
updated-dependencies:
- dependency-name: rubocop-minitest
  dependency-version: 0.40.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: rubocop
...

Signed-off-by: dependabot[bot] <support@github.com>