Bump parallel_tests from 2.27.1 to 2.28.0 (#9985)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 2.27.1 to 2.28.0.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Commits](https://github.com/grosser/parallel_tests/compare/v2.27.1...v2.28.0

)

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