Bump simplecov from 0.18.5 to 0.19.0 (#14590)

Bumps [simplecov](https://github.com/simplecov-ruby/simplecov) from 0.18.5 to 0.19.0.
- [Release notes](https://github.com/simplecov-ruby/simplecov/releases)
- [Changelog](https://github.com/simplecov-ruby/simplecov/blob/main/CHANGELOG.md)
- [Commits](https://github.com/simplecov-ruby/simplecov/compare/v0.18.5...v0.19.0

)

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