Bump simplecov from 0.17.1 to 0.18.1 (#13027)

Bumps [simplecov](https://github.com/colszowka/simplecov) from 0.17.1 to 0.18.1.
- [Release notes](https://github.com/colszowka/simplecov/releases)
- [Changelog](https://github.com/colszowka/simplecov/blob/master/CHANGELOG.md)
- [Commits](https://github.com/colszowka/simplecov/compare/v0.17.1...v0.18.1

)

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