Bump parallel_tests from 3.5.1 to 3.5.2 (#15882)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.5.1 to 3.5.2.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel_tests/compare/v3.5.1...v3.5.2

)

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