Update dependency parallel_tests to '~> 5.5'

This MR contains the following updates:

Package	Update	Change	MyDiffEnd
parallel_tests (changelog)	minor	'~> 5.4' -> '~> 5.5'	https://my.diffend.io/gems/parallel_tests/5.4.0/5.5.0

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Release Notes

grosser/parallel_tests (parallel_tests)

v5.5.0

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